A ?black hole? is a body in space which does not allow any radiation to come out. This property is due to its (a) Very small size (b) Very large size (c) Very high density (d) Very low density

A ?black hole? is a body in space which does not allow
any radiation to come out. This property is due to its
 (a) Very small size
 (b) Very large size
 (c) Very high density
 (d) Very low density
by

1 Answer

Answer :

Ans: ( c ) Very high density
by

Related questions

Black Hole is an invisible area in outer space with gravity so strong that light cannot get out of it, this property is due to?

Description : Black Hole is an invisible area in outer space with gravity so strong that light cannot get out of it, this property is due to?

Last Answer : Very high density

A black hole 'belches' light and radiation whenever something falls into its event horizon. What does that mean and why does that happen? -Space

Description : A black hole 'belches' light and radiation whenever something falls into its event horizon. What does that mean and why does that happen? -Space

Last Answer : A black hole is an astronomical object with a gravitational pull so strong that nothing, not even light, can escape it. A black hole's “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos

Over time, a black hole will evaporate via a process called Hawking radiation. How long will it take for the M87 black hole to fully evaporate? -Space

Description : Over time, a black hole will evaporate via a process called Hawking radiation. How long will it take for the M87 black hole to fully evaporate? -Space

Last Answer : A supermassive black hole with a mass of 1011 (100 billion) M ☉ will evaporate in around 2 10100 years. Some monster black holes in the universe are predicted to continue to grow up to ... the collapse of superclusters of galaxies. Even these would evaporate over a timescale of up to 10106 years.

How black hole has a vast attractive force? What is its density in comparison with Earth and Sun? -Space

Description : How black hole has a vast attractive force? What is its density in comparison with Earth and Sun? -Space

Last Answer : There are two things that affect the escape velocity - the mass of object and the distance to the center of that object. For example, a rocket must accelerate to 11.2 km/s in order to escape Earth's gravity ... the mass of our sun would need to be squeezed into a volume with a radius of about 3 km.

A black body when hot, emits heat radiation of __________ wavelengths. (A) Small (B) Large (C) All (D) One fixed

Description : A black body when hot, emits heat radiation of __________ wavelengths. (A) Small (B) Large (C) All (D) One fixed

Last Answer : (C) All

Pick out the wrong statement. (A) Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value (B) Environmental pollution by NOx emission is much higher by four stroke petrol engines as compared to the two stroke engines (C) Temperature in stratosphere rises with increasing altitude (D) The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere

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Last Answer : (D) The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere

The M87 black hole is supermassive, but relatively compact for its mass. What size does it occupy? -Space

Description : The M87 black hole is supermassive, but relatively compact for its mass. What size does it occupy? -Space

Last Answer : Such incredibly compact objects cause infinite curvature in the fabric of spacetime. Everything that falls into a black hole is sucked toward the singularity. At some distance away from the singularity ... star. Black holes grow by accreting surrounding matter and by merging with other black holes.

According To the Schwarzschild Radius what size would you have to compress the earth to make a black hole? -Space

Description : According To the Schwarzschild Radius what size would you have to compress the earth to make a black hole? -Space

Last Answer : You can define a Schwarzschild Radius based solely on total mass, i.e. Rs=2GMc2. If you plug in the mass of the earth, the radius is about 9 mm --- which is how small you would have to compress it to make a black-hole.

How small can a black hole be? -Space

Description : How small can a black hole be? -Space

Last Answer : There's no minimum size. There's a minimum density. Stars turn themselves into black holes when they exhaust their fuel and collapse. For that to yield a black hole, they need to start off with around 25 solar masses.

Roughly how small would you have to squish the Earth for it to become a black hole? -Space

Description : Roughly how small would you have to squish the Earth for it to become a black hole? -Space

Last Answer : Using the Schwarzschild radius calculation, a black hole the size of Earth would have a radius of less than one inch, making it about as big as a ping pong ball. The Sun, on the other hand, would have a radius of just under two miles.

The accelerometers are commonly used in vibration measurement due to their ___________. (A) small size and low sensitivity (B) the large size and high sensitivity (C) the large size and low sensitivity (D) small size and high sensitivity

Description : The accelerometers are commonly used in vibration measurement due to their ___________. (A) small size and low sensitivity (B) the large size and high sensitivity (C) the large size and low sensitivity (D) small size and high sensitivity

Last Answer : (D) small size and high sensitivity

The accelerometers are commonly used in vibration measurement due to their ___________. (A) small size and low sensitivity (B) the large size and high sensitivity (C) the large size and low sensitivity (D) small size and high sensitivity

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Last Answer : (D) small size and high sensitivity

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in (A) Shallow and small piles (B) Fine sizes without the presence of any lump (C) Closed space without any ventilation facility (D) Large heaps with small surface to volume ratio

Description : To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in (A) Shallow and small piles (B) Fine sizes without the presence of any lump (C) Closed space without any ventilation facility (D) Large heaps with small surface to volume ratio

Last Answer : (A) Shallow and small piles

When our body goes inside a Black Hole an effect acts on our bodies. What is the effect called? -Space

Description : When our body goes inside a Black Hole an effect acts on our bodies. What is the effect called? -Space

Last Answer : Of course, no matter what type of black hole you fall into, you're ultimately going to get torn apart by the extreme gravity. No material, especially fleshy human bodies, could survive intact. So once you pass beyond the edge of the event horizon, you're done. There's no getting out.

In heating frozen foods in sealed pouches in microwaves, why do you first poke holes in the pouch? (1) To prevent the steam pres-sure from bursting open the pouch (2) To allow the heat to get into the food through the hole (3) To allow the microwaves to get into the food through the holes (4) To allow the aroma of the food to come out through the holes

Description : In heating frozen foods in sealed pouches in microwaves, why do you first poke holes in the pouch? (1) To prevent the steam pres-sure from bursting open the pouch (2) To allow the heat to get into ... into the food through the holes (4) To allow the aroma of the food to come out through the holes

Last Answer : (1) To prevent the steam pres-sure from bursting open the pouch Explanation: Anything in a tight skin or shell can explode in a microwave because the water inside can expand and burst through. It ... of shells and holes should be poked in the plastic wrap or sealed pouches of frozen packaged foods.

In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch? (1) To prevent the steam pressure from bursting open the pouch (2) To allow the heat to get into the food through the hole (3) To allow the microwaves to get into the food through the holes (4) To allow the aroma of the food to come out through the holes

Description : In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch? (1) To prevent the steam pressure from bursting open the pouch (2) To allow the heat to get into ... into the food through the holes (4) To allow the aroma of the food to come out through the holes

Last Answer : To prevent the steam pressure from bursting open the pouch

The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as: (A) Ozone hole (B) Atmospheric window (C) Ozone window (D) Black hole

Description : The spectral region of the electromagnetic radiation which passes through the atmosphere without much attenuation is known as: (A) Ozone hole (B) Atmospheric window (C) Ozone window (D) Black hole

Last Answer : Answer: Option B

Mercury is an ideal barometric fluid mainly due to its(A) High density (B) Low compressibility (C) Low capillary action (D) Very low vapor pressure

Description : Mercury is an ideal barometric fluid mainly due to its (A) High density (B) Low compressibility (C) Low capillary action (D) Very low vapor pressure

Last Answer : (D) Very low vapor pressure

An ideal coolant for a nuclear reactor should (A) Be a good absorber of neutrons (B) Be capable of attaining high temperature, only when it is pressurised (C) Have high density, but low heat transfer co-efficient (D) Be free from radiation damage and non-corrosive

Description : An ideal coolant for a nuclear reactor should (A) Be a good absorber of neutrons (B) Be capable of attaining high temperature, only when it is pressurised (C) Have high density, but low heat transfer co-efficient (D) Be free from radiation damage and non-corrosive

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When a star becomes a singularity and has zero volume and infinite density, it is called--------? A. White dwarf B. Blue giant C. Wolf-Raynet star D. Black hole (Answer)

Description : When a star becomes a singularity and has zero volume and infinite density, it is called--------? A. White dwarf B. Blue giant C. Wolf-Raynet star D. Black hole (Answer)

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Can a black hole run out of it's lifetime and die? -Space

Description : Can a black hole run out of it's lifetime and die? -Space

Last Answer : Hawking radiation reduces the mass and rotational energy of black holes and is therefore also known as black hole evaporation. Because of this, black holes that do not gain mass through other ... and ultimately vanish. For all except the smallest black holes, this would happen extremely slowly.

The black hole is approximately 55 million light years away, how was its existence known and how was it pictured with just telescopes? -Space

Description : The black hole is approximately 55 million light years away, how was its existence known and how was it pictured with just telescopes? -Space

Last Answer : The existence of this black hole was first guessed at because the Messier87 galaxy when imaged at radio frequencies shows the signature twin-jets of plasma that are squirted out at near-relativistic ... matter, if one has telescopes with sharp enough vision, which the Event Horizon Telescope had.

What do we call the boundary around a black hole where nothing can escape its gravity? -Space

Description : What do we call the boundary around a black hole where nothing can escape its gravity? -Space

Last Answer : The boundary of the region from which no escape is possible is called the event horizon.

A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the (A) Global warming (B) Green house (C) Atmospheric effect (D) Ionosphere

Description : A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the (A) Global warming (B) Green house (C) Atmospheric effect (D) Ionosphere

Last Answer : (B) Green house

When our sun runs out of lifetime and collapses/explodes, will it transform into a Black Hole? -Space

Description : When our sun runs out of lifetime and collapses/explodes, will it transform into a Black Hole? -Space

Last Answer : The Sun would need to be about 20 times more massive to end its life as a black hole. Stars that are born this size or larger can explode into a supernova at the end of their lifetimes before ... a black hole, an object with a gravitational pull so strong that nothing, not even light, can escape.

Some black holes, including the M87 black hole, shoot narrow “jets” of ionized matter away from the black hole at nearly the speed of light. How far do the jets from the M87 black hole extend? -Space

Description : Some black holes, including the M87 black hole, shoot narrow “jets” of ionized matter away from the black hole at nearly the speed of light. How far do the jets from the M87 black hole extend? -Space

Last Answer : The M87 black hole's jets blast along its axis of rotation to a distance of roughly 5,000 light years.

Does black hole have a life cycle? -Space

Description : Does black hole have a life cycle? -Space

Last Answer : Birth. A stellar-mass black hole starts its life with a death. It's born when a star at least 10 times more massive than our Sun runs out of fuel, having already fused hydrogen into helium, and helium into other elements, from carbon and oxygen all the way up to iron deep in the star's core.

How did the New Horizon Telescope capture the image of a black hole? -Space

Description : How did the New Horizon Telescope capture the image of a black hole? -Space

Last Answer : Using the Event Horizon Telescope, scientists obtained an image of the black hole at the center of galaxy M87, outlined by emission from hot gas swirling around it under the influence of strong gravity near its event horizon.

Why we see it as a black hole? Why can't it be a space with absence of visible spectrum? -Space

Description : Why we see it as a black hole? Why can't it be a space with absence of visible spectrum? -Space

Last Answer : The bending of light around a black hole is very significant because of its extremely large mass. Because of this bending, we see light from material that is behind the black hole, which we would not see if light were traveling in straight lines

Does time works inside black hole? -Space

Description : Does time works inside black hole? -Space

Last Answer : Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. ... Inside the black hole, the flow of time itself draws falling objects into the ... . No force in the universe can stop this fall, any more than we can stop the flow of time.

How is the black hole study useful to us and is it in anyway relevant to the gravitational waves? -Space

Description : How is the black hole study useful to us and is it in anyway relevant to the gravitational waves? -Space

Last Answer : guess it is true that there is unlikely to be any event in the near future endangering human life that involves Black Holes. However, if that were the criteria upon which we based what we should ... people have a better standard of living and I believe has already been used to rescue lost people.

How close did Interstellar get to the depiction of a black hole? -Space

Description : How close did Interstellar get to the depiction of a black hole? -Space

Last Answer : At the heart of every galaxy lies a supermassive black hole, where gravity is so strong that nothing — not even light — can escape its boundary. In the movie "Interstellar," a fictional black hole called Gargantua takes center stage. The film came out exactly five years ago, in November 2014

Why does everything in our galaxy orbit the supermassive black hole at the center? -Space

Description : Why does everything in our galaxy orbit the supermassive black hole at the center? -Space

Last Answer : These black holes sank to the center of gravity, the heart of their host galaxy. Since galaxies evolve by merging and colliding with one another, collisions between galaxies will result in supermassive black hole ... the key part of this story. The black holes then collide and grow in size as well.

How can you differentiate between a black hole made up of antimatter from a black hole made up of matter? -Space

Description : How can you differentiate between a black hole made up of antimatter from a black hole made up of matter? -Space

Last Answer : In fact, there is no difference between an antimatter black hole and a regular-matter black hole if they have the same mass, charge, and angular-momentum. ... Antimatter has positive mass just like regular matter and experiences gravity the same way.

Does every black hole contain a singularity? -Space

Description : Does every black hole contain a singularity? -Space

Last Answer : In the real universe, no black holes contain singularities. In general, singularities are the non-physical mathematical result of a flawed physical theory. When scientists talk about black hole singularities, ... theory, it is simply a sign that your theory is too simple to handle extreme cases.

Which of these radiations is used to study the black hole? -Space

Description : Which of these radiations is used to study the black hole? -Space

Last Answer : When our eyes look at the heavens we see the visible light from stars and other objects in the Universe. Thousands of years ago astronomers in Greece and other ancient cultures already built a detailed ... . We encounter radio waves often in our daily lives, for example in radios and cell phones.

Who discovered the first strong candidate for a black hole? -Space

Description : Who discovered the first strong candidate for a black hole? -Space

Last Answer : Albert Einstein

What pulls objects into a black hole? -Space

Description : What pulls objects into a black hole? -Space

Last Answer : Black holes don't suck. Suction is caused by pulling something into a vacuum, which the massive black hole definitely is not. Instead, objects fall into them just as they fall toward anything that exerts gravity, like the Earth

Which of these is not related to the science of black hole? -Space

Description : Which of these is not related to the science of black hole? -Space

Last Answer : A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Is a black hole really a hole? -Space

Description : Is a black hole really a hole? -Space

Last Answer : black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

How big can a black hole be? -Space

Description : How big can a black hole be? -Space

Last Answer : A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses ( M ☉), and is theorized to exist in the center of almost all massive galaxies.

What is the area surrounding a black hole called? -Space

Description : What is the area surrounding a black hole called? -Space

Last Answer : The event horizon is the "point of no return" around the black hole. It is not a physical surface, but a sphere surrounding the black hole that marks where the escape velocity is equal to the speed of light.

What surrounds a black hole? -Space

Description : What surrounds a black hole? -Space

Last Answer : There are two basic parts to a black hole: the singularity and the event horizon. The event horizon is the "point of no return" around the black hole. It is not a physical surface, but a sphere surrounding the black hole that marks where the escape velocity is equal to the speed of light

How is a black hole formed? -Space

Description : How is a black hole formed? -Space

Last Answer : Stellar black holes form when the center of a very massive star collapses in upon itself. This collapse also causes a supernova, or an exploding star, that blasts part of the star into space. Scientists think supermassive black holes formed at the same time as the galaxy they are in.

Can a black hole collapse on itself? -Space

Description : Can a black hole collapse on itself? -Space

Last Answer : A black hole with a mass of around 1 solar mass will evaporate in around 2×1066 years. All objects with a temperature will emit radiation.

When was the first picture of the black hole taken? -Space

Description : When was the first picture of the black hole taken? -Space

Last Answer : answer:

What is Singularity of the Black Hole? -Space

Description : What is Singularity of the Black Hole? -Space

Last Answer : A gravitational singularity, spacetime singularity or simply singularity is a location in spacetime where the mass and gravitational field of a celestial body is predicted to become infinite by general relativity in a way that does not depend on the coordinate system.

When did Albert Einstein Predict the black hole with his theory of relativity? -Space

Description : When did Albert Einstein Predict the black hole with his theory of relativity? -Space

Last Answer : answer:

Which is the oldest black hole? -Space

Description : Which is the oldest black hole? -Space

Last Answer : Quasar J0313-1806