The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ----? A. 1120 ft B. 120 ft C. 56 ft (Answer) D. 100 ft E. None of these

The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the

distance of the reflecting surfaces from the source of sound is at least ----?

A. 1120 ft

B. 120 ft

C. 56 ft (Answer)

D. 100 ft

E. None of these
by

1 Answer

Answer :

C. 56 ft (Answer)
by

Related questions

A car covers a distance of 1120 metres in 1 minute whereas a bus covers a distance of 56 kms in 44 minutes. What is the ratio of their speed? a) 22:25 b) 25:22 c) 11:15 d) 15:11

Description : A car covers a distance of 1120 metres in 1 minute whereas a bus covers a distance of 56 kms in 44 minutes. What is the ratio of their speed? a) 22:25 b) 25:22 c) 11:15 d) 15:11

Last Answer : A Speed of the Car = 1120 m/minute Speed of the bus=56 kms in 44 minutes =56/44 km/m =56000/44 m/mints Speed of the car : Speed of the bus, =1120:56000/44 =280:14000/44 =20:1000/44 =880:1000 =88:100 Required ratio =22:25

The time interval between the original sound and the reflected sound for an echo to be

Description : The time interval between the original sound and the reflected sound for an echo to be

Last Answer : heard is >=0.1s.

To hear distinct echo each time interval between original sound and reflected sound must be a)0.2sec b)1sec c)2sec d)0.1sec

Description : To hear distinct echo each time interval between original sound and reflected sound must be a)0.2sec b)1sec c)2sec d)0.1sec

Last Answer : d)0.1sec

Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This entire process is generally known as (A) Hydrological cycle (B) Water cycle (C) Evaporation and precipitation cycle (D) All the above

Description : Water gets evaporated from water surfaces and land surfaces, get converted into water drops at lower temperatures, flows over ground surface and finally meets its source, i.e. lake, sea, etc. This ... Hydrological cycle (B) Water cycle (C) Evaporation and precipitation cycle (D) All the above

Last Answer : (D) All the above

Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected ray?

Description : Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected ray?

Last Answer : ANSWER: 30 DEGREES

Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. (A) 90 (B) 120 (C) 150 (D) 180

Description : Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. (A) 90 (B) 120 (C) 150 (D) 180

Last Answer : (B) 120

Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels. (A) 120 (B) 140 (C) 170 (D) 200

Description : Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels. (A) 120 (B) 140 (C) 170 (D) 200

Last Answer : (C) 170

What is the minimum distance between the reflector and the source to hear the echo? ?

Description : What is the minimum distance between the reflector and the source to hear the echo? ?

Last Answer : The minimum distance between the reflector and the source to hear the echo is 18.6 meters.

In acoustics, _____ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener. A. flanking B. reverberation C. Doppler effect D. echo

Description : In acoustics, _____ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener. A. flanking B. reverberation C. Doppler effect D. echo

Last Answer : C. Doppler effect

The sound which continues even after its source is cut off, is called (A) Reverberation (B) Echo (C) Intensity of sound (D) Interferenc

Description : The sound which continues even after its source is cut off, is called (A) Reverberation (B) Echo (C) Intensity of sound (D) Interferenc

Last Answer : Answer: Option A

Newton’s rings are formed because of interference between the light Reflected from (a) Upper surface of Plano-convex lens and lower surface of plane glass plate (b) Lower surface of Plano-convex lens and upper surface of plane glass plate (c) Lower and upper surface of Plano-convex (d) Lower and upper surfaces of plane glass plate

Description : Newton's rings are formed because of interference between the light Reflected from (a) Upper surface of Plano-convex lens and lower surface of plane glass plate (b) Lower surface of Plano-convex ... c) Lower and upper surface of Plano-convex (d) Lower and upper surfaces of plane glass plate

Last Answer : (b) Lower surface of Plano-convex lens and upper surface of plane glass plate

Echo is a ------ of sound? A. Reflection (Answer) B. Refraction C. Interference D. None

Description : Echo is a ------ of sound? A. Reflection (Answer) B. Refraction C. Interference D. None

Last Answer : A. Reflection (Answer)

At same temperatures, the radiation emitted by all real surfaces is ______ the radiation emitted by a black body.  A. Less than  B. Greater than  C. Equal to  D. Either less than or greater than

Description : At same temperatures, the radiation emitted by all real surfaces is ______ the radiation emitted by a black body.  A. Less than  B. Greater than  C. Equal to  D. Either less than or greater than

Last Answer : Less than

The heat generated in ordinary cement at the end of 3 days is about [ A ] 60 cal/g [ B ] 80 cal/g [ C ] 100 cal/g [ D ] 120 cal/g

Description : The heat generated in ordinary cement at the end of 3 days is about [ A ] 60 cal/g [ B ] 80 cal/g [ C ] 100 cal/g [ D ] 120 cal/g

Last Answer : [ B ] 80 cal/g

There is an island with exactly 201 residents, 100 with blue eyes, 100 with brown eyes, and the island leader (who has green eyes). To leave the island, one must know their own eye color. There are no reflective surfaces on the island and no on can communicate with each other other than the leader to the residents. No one on the island knows how many of each eye color there is. Everyone on the island is a perfect logician, meaning that if there is a solution they'll find it. Every morning the leader gives anyone a chance to leave the island by guessing their eye color. One morning, the leader gathers all 200 residents to make an announcement, he says 'at least 1 person on this island has blue eyes' How many people leave the island and in how many days after the announcement? Notes: this is

Description : There is an island with exactly 201 residents, 100 with blue eyes, 100 with brown eyes, and the island leader (who has green eyes). To leave the island, one must know their own eye color. There ... How many people leave the island and in how many days after the announcement? Notes: this is -Riddles

Last Answer : All 100 blue eyed people in 100 days. EXPLANATION: imagine there is only 1 person on the island, he will look around and see that there are no blue eyed people, he will then know his eye color in ... is needed to know their own eye color. if you would like more info, search '100 blue eyes riddle

A sound wave that is reflected back toward the source is known as what type of sound?

Description : A sound wave that is reflected back toward the source is known as what type of sound?

Last Answer : Echo.

A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of a.56,900 ft b.107 dynes c.75,000 ft d.48.300 ft e.65,800 ft

Description : A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of a.56,900 ft b.107 dynes c.75,000 ft d.48.300 ft e.65,800 ft

Last Answer : c. 75,000 ft

ECE Board Exam March 1996 A car horn outdoors produces a sound intensity level of 90 dB at 10 ft away. At this distance, what is the sound power in watt? A. 12 W B. 0.12 W C. 0.012 W D. 1.2 W

Description : ECE Board Exam March 1996 A car horn outdoors produces a sound intensity level of 90 dB at 10 ft away. At this distance, what is the sound power in watt? A. 12 W B. 0.12 W C. 0.012 W D. 1.2 W

Last Answer : C. 0.012 W

More than one echo is heard due to

Description : More than one echo is heard due to

Last Answer : multiple reflections from the reflecting surfaces.

Radar is used for (a) Detecting objects by using light waves (b) Reflecting sound waves to detect objects (c) Determining the presence and location of objects with radio waves (d) Tracking rain-bearing clouds

Description : Radar is used for (a) Detecting objects by using light waves (b) Reflecting sound waves to detect objects (c) Determining the presence and location of objects with radio waves (d) Tracking rain-bearing clouds

Last Answer : Ans:(b)

Is a 56 ft 65 ft 16ft triangle a right angle triangle?

Description : Is a 56 ft 65 ft 16ft triangle a right angle triangle?

Last Answer : The ratio of the length of the side of a right angle trianglemust be 3,4,516,56,65are not in that ratio.

Is 56 ft 65ft 16ft a right triangle?

Description : Is 56 ft 65ft 16ft a right triangle?

Last Answer : No because the given dimensions do not comply with Pythagoras'theorem for a right angle triangle

Is 56 ft 65 ft 16 ft a triangle?

Description : Is 56 ft 65 ft 16 ft a triangle?

Last Answer : Yes, the three given lengths will form a triangle.Three lengths can make a triangle if, and only if, the sum ofthe two shorter lengths is greater than the longest length.The two shorter lengths are 56 ft and 16 ft ... = 72 ft72 ft is greater than 65 ft so 56 ft, 65 ft and 16 ft will makea triangle.

If "ordinary least squares" doesn't mean anything to you, what does it sound like it means?

Description : If "ordinary least squares" doesn't mean anything to you, what does it sound like it means?

Last Answer : I have no idea what that means… It really does sound like gibberish to me. Not long ago, I asked a question in reference to something I thought up, which is” Innate intelligence is reflective self-awareness” That makes perfect sense to me but it didn’t to the people answering the question.

What reflecting surface forms a geometrically perfect image of a point source located at infinity (such as that approximated by a star)? w) Paraboloid x) Ellipsoid y) spherical z) Hyperboloid

Description : What reflecting surface forms a geometrically perfect image of a point source located at infinity (such as that approximated by a star)? w) Paraboloid x) Ellipsoid y) spherical z) Hyperboloid

Last Answer : ANSWER: W -- PARABOLOID

`(x+3)(x+4)(x+6)(x+7)=1120`.

Description : `(x+3)(x+4)(x+6)(x+7)=1120`.

Last Answer : `(x+3)(x+4)(x+6)(x+7)=1120`.

How many times will 8 go into 1120?

Description : How many times will 8 go into 1120?

Last Answer : 1120 ÷ 8 = 140

What is 1120 simplified into a fraction?

Description : What is 1120 simplified into a fraction?

Last Answer : 1120 is an integer and not a fraction. However, it can beexpressed in rational form as 1120/1 which cannot besimplified.

How much does the 1120 tax software cost?

Description : How much does the 1120 tax software cost?

Last Answer : The 1120 is an IRS tax form, not tax software. It costs about ten dollars to access and use the form in Tax Act, Turbo Tax, or H and R block web software.

What does this 1120 tax software do for me if I have it?

Description : What does this 1120 tax software do for me if I have it?

Last Answer : 1120 tax software is a program that will help you prepare and file your taxes on your computer. It makes doing taxes easier and quicker when doing them yourself.

Using 1120 Tax Software?

Description : Using 1120 Tax Software?

Last Answer : IRS Form 1120 is the form needed for C corporations to complete their tax returns. Form 1120S is used for S Corporations to file their tax returns. Some corporations choose to hire a CPA ... . Many tax software companies offer software that you can download to your computer or complete online.

In 2001, 6400 candidates appeared at the exam and 40% of them qualified. In 2005 the ratio between qualified males and females was 3:5. What is the total number of female candidates who qualified in these two years? A. 1120 B. 1220 C. 1330 D. 1150

Description : In 2001, 6400 candidates appeared at the exam and 40% of them qualified. In 2005 the ratio between qualified males and females was 3:5. What is the total number of female candidates who qualified in these two years? A. 1120 B. 1220 C. 1330 D. 1150

Last Answer : B. 1220

The distance of Venus form the sun as determine by radar echo method is found to be `1.082xx10^(11)m`. The period of its revolution is 224.633 days. I

Description : The distance of Venus form the sun as determine by radar echo method is found to be `1.082xx10^(11)m`. The period of its revolution is 224.633 days. I

Last Answer : The distance of Venus form the sun as determine by radar echo method is found to be `1.082xx10^( ... , compute the distance of the earth from the sun.

To hear a clear echo, the distance between the listener and the reflector should be

Description : To hear a clear echo, the distance between the listener and the reflector should be

Last Answer : 17 METER

What is the minimum distance (in metres) required to hear an echo? (1) 10 (2) 13 (3) 17 (4) 21

Description : What is the minimum distance (in metres) required to hear an echo? (1) 10 (2) 13 (3) 17 (4) 21

Last Answer : (3) 17 Explanation: The human ear cannot distinguish echo from the original direct sound if the delay is less than 1/15 of a second. The velocity of sound in dry air is approximately 343 m/s at a temperature of 25⁰C.

The minimum distance required for an echo to occur is _______. a)30m b)17.2m c)100m d)20m

Description : The minimum distance required for an echo to occur is _______. a)30m b)17.2m c)100m d)20m

Last Answer : b)17.2m

Echo sounding is the technique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere

Description : Echo sounding is the technique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere

Last Answer : (1) measure the depth of the sea Explanation: Echo sounding is the technique of using sound pulses to find the depth of water. The interval from the emission of a pulse to reception ... information is then typically used for navigation purposes or in order to obtain depths for charting purposes.

Which phenomenon do bats or dolphins use to find prey, predators or obstacles? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Description : Which phenomenon do bats or dolphins use to find prey, predators or obstacles? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Last Answer : (4) Echo location Explanation: Echolocation, also called biosonar, is the biological sonar used by several kinds of animals. Echolocating animals emit calls out to the environment and ... swiftlets in the genus Aerodramus (formerly Collocalia) and the unrelated Of bird Steatornis caripensis.

Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarization

Description : Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarization

Last Answer : (1) Reflection Explanation: Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the ... reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.

Which of the following is NOT an acoustical defect to be avoided in acoustical designs? A. Reverberation B. Flutter echo C. Distortion D. Sound concentration

Description : Which of the following is NOT an acoustical defect to be avoided in acoustical designs? A. Reverberation B. Flutter echo C. Distortion D. Sound concentration

Last Answer : A. Reverberation

What do you call the perceptible sound repetition? A. Reverberation B. Echo C. Reflection D. Masking

Description : What do you call the perceptible sound repetition? A. Reverberation B. Echo C. Reflection D. Masking

Last Answer : B. Echo

The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Description : The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Last Answer : A : Active Sonar

The sensor that sends out sound pulses called pings, then receives thereturning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Description : The sensor that sends out sound pulses called pings, then receives thereturning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Last Answer : A : Active Sonar

The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Description : The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Last Answer : A : Active Sonar

Which phenomenon do bats or dolphins use to find prey, predators or obstacles ? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Description : Which phenomenon do bats or dolphins use to find prey, predators or obstacles ? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Last Answer : Echo location

Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarisation

Description : Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarisation

Last Answer : Reflection

Echo sounding is the tech-nique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere

Description : Echo sounding is the tech-nique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere

Last Answer :  measure the depth of the sea

What inspired reflecting road lights to be invented? A. Car door reflecting mirrors B. The light a cat’s eyes gave off on a fence (Answer) C. Sun light on steel posts on road sides D. The sun light on the windshield

Description : What inspired reflecting road lights to be invented? A. Car door reflecting mirrors B. The light a cat’s eyes gave off on a fence (Answer) C. Sun light on steel posts on road sides D. The sun light on the windshield

Last Answer : B. The light a cat’s eyes gave off on a fence (Answer)

The distance of mercury from sun is-----? A. 56 million km B. 57.9 million km (Answer) C. 58.9 million km D. 59.1 million

Description : The distance of mercury from sun is-----? A. 56 million km B. 57.9 million km (Answer) C. 58.9 million km D. 59.1 million

Last Answer : B. 57.9 million km