The Laser is a beam of radiations which are – (1) Non-coherent and monochromatic (2) Coherent and monochromatic (3) Non-coherent and non-monochromatic (4) Coherent and non-monochromatic

The Laser is a beam of radiations which are – (1) Non-coherent and monochromatic (2) Coherent and monochromatic (3) Non-coherent and non-monochromatic (4) Coherent and non-monochromatic
by

1 Answer

Answer :

(2) Coherent and monochromatic Explanation: Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths.
by
selected

Related questions

The Laser is a beam of radiations which are (1) Non-coherent and monochromatic (2) Coherent and monochromatic (3) Non-coherent and non-monochromatic (4) Coherent and non-monochromatic

Description : The Laser is a beam of radiations which are (1) Non-coherent and monochromatic (2) Coherent and monochromatic (3) Non-coherent and non-monochromatic (4) Coherent and non-monochromatic 

Last Answer : Coherent and monochromatic

Laser light is very bright because it is ∙ a. Pure ∙ b. White ∙ c. Coherent ∙ d. Monochromatic

Description : Laser light is very bright because it is ∙ a. Pure ∙ b. White ∙ c. Coherent ∙ d. Monochromatic

Last Answer : c. Coherent

____ is a light that can be coherent ∙ a. Spontaneous emission ∙ b. Monochromatic and in-phase ∙ c. Narrow beam divergence ∙ d. Monochromatic

Description : ____ is a light that can be coherent ∙ a. Spontaneous emission ∙ b. Monochromatic and in-phase ∙ c. Narrow beam divergence ∙ d. Monochromatic

Last Answer : ∙ b. Monochromatic and in-phase

Lasers are used to produce a) Intense beam of visible light b) monochromatic beam of visible light c) coherent beam of visible light d) All of them

Description : Lasers are used to produce a) Intense beam of visible light b) monochromatic beam of visible light c) coherent beam of visible light d) All of them

Last Answer : d) All of them

Laser radiation is: w) monochromatic x) directed in a narrow beam y) produced with large power densities z) all of the above

Description : Laser radiation is: w) monochromatic x) directed in a narrow beam y) produced with large power densities z) all of the above

Last Answer : ANSWER: Z -- ALL OF THE ABOVE

Laser is a device to produce - (1) a beam of white light (2) coherent light (3) microwaves (4) X-rays

Description : Laser is a device to produce - (1) a beam of white light (2) coherent light (3) microwaves (4) X-rays

Last Answer : (2) coherent light Explanation: In physics, two wave sources are perfectly coherent if they have a constant phase difference and the same frequency, and the same waveform. Coherence is an ideal property of waves that enables stationary (i.e. temporally and spatially constant) interference.

Laser is a device to produce (A) Gamma rays (B) Microwaves (C) A beam of white light (D) A beam of coherent light

Description : Laser is a device to produce (A) Gamma rays (B) Microwaves (C) A beam of white light (D) A beam of coherent light

Last Answer : Option B

Single frequency light is called ∙ A. pure ∙ B. intense ∙ C. coherent ∙ D. monochromatic

Description : Single frequency light is called ∙ A. pure ∙ B. intense ∙ C. coherent ∙ D. monochromatic

Last Answer : D. monochromatic

Single-frequency light is called ∙ a. Pure ∙ b. Intense ∙ c. Coherent ∙ d. Monochromatic

Description : Single-frequency light is called ∙ a. Pure ∙ b. Intense ∙ c. Coherent ∙ d. Monochromatic

Last Answer : d. Monochromatic

Laser light is ______ emission. a. Coherent b. Stimulated c. Spontaneous d. Coherent and stimulated

Description : Laser light is ______ emission. a. Coherent b. Stimulated c. Spontaneous d. Coherent and stimulated

Last Answer : d. Coherent and stimulated

Laser light is ______ emission. ∙ a. Coherent ∙ b. Stimulated ∙ c. Spontaneous ∙ d. Coherent and stimulated

Description : Laser light is ______ emission. ∙ a. Coherent ∙ b. Stimulated ∙ c. Spontaneous ∙ d. Coherent and stimulated

Last Answer : ∙ d. Coherent and stimulated

The X –ray beam coming from an X-ray tube will be (a) Monochromatic (b) Having all wavelengths larger than a certain minimum wavelength (c) Having all wavelengths smaller than a certain maximum wavelength (d) Having all wavelengths between a minimum and a maximum wavelength

Description : The X –ray beam coming from an X-ray tube will be (a) Monochromatic (b) Having all wavelengths larger than a certain minimum wavelength (c) Having all wavelengths smaller than a certain maximum wavelength (d) Having all wavelengths between a minimum and a maximum wavelength

Last Answer : Ans:(b)

How bright is a laser beam when viewed from the side? -Physics

Description : How bright is a laser beam when viewed from the side? -Physics

Last Answer : While traveling through the vacuum of space, laser beams are invisible unless shot directly into your eye. The experience you know of as vision consists of light entering your eyes and being detecting by cells ... dramatic to see a flash of light shoot out of a gun than nothing visible shoot out.

Where are mesons found? (1) Cosmic rays (2) X-rays (3) Gamma rays (4) Laser beam

Description : Where are mesons found? (1) Cosmic rays (2) X-rays (3) Gamma rays (4) Laser beam

Last Answer : (1) Cosmic rays Explanation: Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made ... subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction.

Light beam which is highly directional is called: (1) eraser (2) grazer (3) maser (4) laser

Description : Light beam which is highly directional is called: (1) eraser (2) grazer (3) maser (4) laser

Last Answer : (4) laser Explanation: Laser light is very different from normal light. It is very directional, has a very tight beam and is very strong and concentrated. The light released is monochromatic. It contains one specific wavelength of light (one specific colour).

The characteristic that distinguishes a laser beam from an ordinary light beam is: w) the greater frequency of the laser beam x) the coherence of the laser beam y) the color of the laser beam z) the greater polarization of the laser beam

Description : The characteristic that distinguishes a laser beam from an ordinary light beam is: w) the greater frequency of the laser beam x) the coherence of the laser beam y) the color of the laser beam z) the greater polarization of the laser beam

Last Answer : ANSWER: X -- THE COHERENCE OF THE LASER BEAM

Light beam which is highly directional is called: (1) eraser (2) grazer (3) maser (4) laser

Description : Light beam which is highly directional is called: (1) eraser (2) grazer (3) maser (4) laser

Last Answer : laser

Where are mesons found ? (1) Cosmic rays (2) X-rays (3) Gamma rays (4) Laser beam

Description : Where are mesons found ? (1) Cosmic rays (2) X-rays (3) Gamma rays (4) Laser beam

Last Answer : Cosmic rays

In Fraunhofer diffraction wave front used is __________. A. Spherical B. Circular C. Plane D. Conical 71.In diffraction pattern of monochromatic light the bright bands formed are __________. A. of uniform intensity B. of non-uniform intensity C. of uniform width D. is of different colors

Description : In Fraunhofer diffraction wave front used is __________. A. Spherical B. Circular C. Plane D. Conical 71.In diffraction pattern of monochromatic light the bright bands formed are __________. A. of uniform intensity B. of non-uniform intensity C. of uniform width D. is of different colors

Last Answer : A. of uniform intensity

Is a non-coherent light source foe optical communications system. a. ILD b. LED c. APD d. PIN Diode

Description : Is a non-coherent light source foe optical communications system. a. ILD b. LED c. APD d. PIN Diode

Last Answer : b. LED

A non-coherent light source for optical communications system. A. PIN Diode B. ILD C. APD D. LED

Description : A non-coherent light source for optical communications system. A. PIN Diode B. ILD C. APD D. LED

Last Answer : D. LED

. Is a non-coherent light source foe optical communications system. ∙ a. ILD ∙ b. LED ∙ c. APD ∙ d. PIN Diode

Description : . Is a non-coherent light source foe optical communications system. ∙ a. ILD ∙ b. LED ∙ c. APD ∙ d. PIN Diode

Last Answer : ∙ b. LED

It is dangerous to observe solar eclipse with naked eyes because – (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Description : It is dangerous to observe solar eclipse with naked eyes because – (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Last Answer : (2) Ultraviolet radiations from Sun burn our retina Explanation: The solar radiation that reaches the surface of Earth ranges from ultraviolet (UV) radiation at wavelengths longer than 290 nm to radio ... of the Sun during an eclipse is for the development of "eclipse blindness" or retinal burns.

Ozone layer in the outer atmosphere helps us in – (1) reflecting radio waves and makes radio communication possible (2) regulating he temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations

Description : Ozone layer in the outer atmosphere helps us in – (1) reflecting radio waves and makes radio communication possible (2) regulating he temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations

Last Answer : (4) absorbing U-V radiations Explanation: The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97- 99% of the Sun's medium-frequency ultraviolet light.

A black body can absorb radiations of (1) lower wavelengths only (2) intermediate wavelengths only (3) higher wavelengths only (4) all wavelengths

Description : A black body can absorb radiations of (1) lower wavelengths only (2) intermediate wavelengths only (3) higher wavelengths only (4) all wavelengths

Last Answer : (4) all wavelengths Explanation: A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular ... as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.

Beta rays emitted by a radioactive material are – (1) The electrons orbiting around the nucleus (2) Charged particles emitted by nucleus (3) Neutral particles (4) Electromagnetic radiations

Description : Beta rays emitted by a radioactive material are – (1) The electrons orbiting around the nucleus (2) Charged particles emitted by nucleus (3) Neutral particles (4) Electromagnetic radiations

Last Answer : (2) Charged particles emitted by nucleus Explanation: A beta ray is a high-energy, highspeed electron (negatively charged) or positron (positively charged) emitted in the radioactive decay of an atomic nucleus, such as a potassium40 nucleus, in the process of beta decay.

Which, of the following radiations has the least wavelength? (1) X-rays (2) a-rays (3) g-rays (4) b-rays

Description : Which, of the following radiations has the least wavelength? (1) X-rays (2) a-rays (3) g-rays (4) b-rays

Last Answer : (3) g-rays Explanation: X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre

Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by – (1) Carbon dioxide (2) Ammonia (3) Chlorine (4) Ozone

Description : Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by – (1) Carbon dioxide (2) Ammonia (3) Chlorine (4) Ozone

Last Answer : (4) Ozone Explanation: The ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth. Ozone ... Earth's atmosphere. In total, ozone makes up only 0.6 parts per million of the atmosphere.

Which of the following three nuclear radiations is the most penetrating? w) alpha x) beta y) gamma

Description : Which of the following three nuclear radiations is the most penetrating? w) alpha x) beta y) gamma

Last Answer : ANSWER: Y -- GAMMA

Beta rays emitted by a radioactive material are (1) The electrons orbiting around the nucleus (2) Charged particles emitted by nucleus (3) Neutral particles (4) Electromagnetic radiations

Description : Beta rays emitted by a radioactive material are (1) The electrons orbiting around the nucleus (2) Charged particles emitted by nucleus (3) Neutral particles (4) Electromagnetic radiations

Last Answer : Charged particles emitted by nucleus

Which, of the following radiations has the least wavelength ? (1) X-rays (2) a-rays (3) g-rays (4) b-rays

Description : Which, of the following radiations has the least wavelength ? (1) X-rays (2) a-rays (3) g-rays (4) b-rays

Last Answer : g-rays

Ozone layer in the outer atmosphere helps us in (1) reflecting radio waves and makes radio communication possible (2) regulating the temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations

Description : Ozone layer in the outer atmosphere helps us in (1) reflecting radio waves and makes radio communication possible (2) regulating the temperature of atmosphere (3) absorbing cosmic ray particles (4) absorbing U-V radiations

Last Answer :  absorbing U-V radiations

A black body can absorb radiations of ; (1) lower wavelengths only (2) intermediate wavelengths only (3) higher wavelengths only (4) all wavelengths

Description : A black body can absorb radiations of ; (1) lower wavelengths only (2) intermediate wavelengths only (3) higher wavelengths only (4) all wavelengths

Last Answer : all wavelengths

It is dangerous to observe Solar eclipse with naked eyes because (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Description : It is dangerous to observe Solar eclipse with naked eyes because (1) Infrared radiations from sun burn our retina (2) Ultraviolet radiations from Sun burn our retina (3) All radiations from sun initiate chemical reactions in eyes (4) Cosmic rays reach eyes more during the eclipse

Last Answer : Ultraviolet radiations from Sun burn our retina

Ultra violet radiations of the Sun do not reach the earth because, earth’s atmosphere is surrounded by (1) Carbon dioxide (2) Ammonia (3) Chlorine (4) Ozone

Description : Ultra violet radiations of the Sun do not reach the earth because, earth’s atmosphere is surrounded by (1) Carbon dioxide (2) Ammonia (3) Chlorine (4) Ozone

Last Answer : Ozone

Non-ionising radiations damaging to DNA are

Description : Non-ionising radiations damaging to DNA are

Last Answer : Non-ionising radiations damaging to DNA are A. X-rays B. U.V. rays C. Gamma rays D. Beta rays

UV light falls in the category of------? A. Ionizing Radiations (Answer) B. Non Ionizing Radiation C. Visible light D. None

Description : UV light falls in the category of------? A. Ionizing Radiations (Answer) B. Non Ionizing Radiation C. Visible light D. None

Last Answer : A. Ionizing Radiations (Answer)

Why is a green laser beam visible while a red or blue beam is not?

Description : Why is a green laser beam visible while a red or blue beam is not?

Last Answer : answer:See this site for a graph of the visibility spectrum. Here is an excerpt: The actual visibility of the ray will vary depending on the color, power, moisture and dust content in the air.. ... on a foggy night the ray can be strikingly visible but the impact point will be of limited range.

Which of the following is not Powder-Based RP system? a.Selective Laser Sintering (SLS) b.Solid Object Ultraviolet-Laser Printer (SOUP) c.Electron Beam Melting (EBM) d.Direct Metal Deposition (DMD)

Description : Which of the following is not Powder-Based RP system? a.Selective Laser Sintering (SLS) b.Solid Object Ultraviolet-Laser Printer (SOUP) c.Electron Beam Melting (EBM) d.Direct Metal Deposition (DMD)

Last Answer : b.Solid Object Ultraviolet-Laser Printer (SOUP)

Who discovered laser beam ?

Last Answer : Laser ray was invented by "Myman" in 1970.

Which method is used for creating a photo with the help of a laser beam in 3D?

Description : Which method is used for creating a photo with the help of a laser beam in 3D?

Last Answer : Holography

Meson particles are found in- (1) R-rays (2) X-rays (3) Laser beam (4) Cosmic rays

Description : Meson particles are found in- (1) R-rays (2) X-rays (3) Laser beam (4) Cosmic rays

Last Answer : (4) Cosmic rays Explanation: Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behavior of their constituent quarks.

In laser printers, printing is achieved by deflecting laser beam on to __________ surface of a drum. A. Magnetic B. Electric C. Photosensitive D. None of the Above

Description : In laser printers, printing is achieved by deflecting laser beam on to __________ surface of a drum. A. Magnetic B. Electric C. Photosensitive D. None of the Above

Last Answer : C. Photosensitive

The first laser emitted a. Pulses of 694 nm red light b. A continuous red beam c. Pulses of white light from a helical flashlamp d. Spontaneous emission

Description : The first laser emitted a. Pulses of 694 nm red light b. A continuous red beam c. Pulses of white light from a helical flashlamp d. Spontaneous emission

Last Answer : a. Pulses of 694 nm red light

A dielectric waveguide for the propagation of electromagnetic energy at light frequencies a. Stripline b. Microstrip c. Laser beam d. Fiber optics

Description : A dielectric waveguide for the propagation of electromagnetic energy at light frequencies a. Stripline b. Microstrip c. Laser beam d. Fiber optics

Last Answer : d. Fiber optics

What generates a light beam of a specific visible frequency? a. Laser b. Maser c. Infrared d. Flashlight

Description : What generates a light beam of a specific visible frequency? a. Laser b. Maser c. Infrared d. Flashlight

Last Answer : a. Laser

________ generates light beam at a specific visible frequency. A. Glass fiber B. Infrared C. Light waves D. Laser

Description : ________ generates light beam at a specific visible frequency. A. Glass fiber B. Infrared C. Light waves D. Laser

Last Answer : D. Laser

Which of the following sensor uses a laser beam to determine the distance to an object? A : Sonar B : Radar C : Infrared D : Laser Rangefinder

Description : Which of the following sensor uses a laser beam to determine the distance to an object? A : Sonar B : Radar C : Infrared D : Laser Rangefinder

Last Answer : D : Laser Rangefinder

Generative cell was destroyed by laser but a normal pollen tube was still formed because (a) vegetative cell is not damaged(b) contents of killed generative cell stimulate pollen growth (c) laser beam stimulates growth of pollen tube (d) the region of emergence of pollen tube is not harmed.

Description : Generative cell was destroyed by laser but a normal pollen tube was still formed because (a) vegetative cell is not damaged (b) contents of killed generative cell stimulate pollen growth (c) laser beam stimulates growth of pollen tube (d) the region of emergence of pollen tube is not harmed.

Last Answer : (a) vegetative cell is not damaged

An example of an analog communication method is a. laser beam b. microwave c. voice grade telephone line d. all of the above

Description : An example of an analog communication method is a. laser beam b. microwave c. voice grade telephone line d. all of the above

Last Answer : all of the above