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(a) A particular transmitter of Aakashvani broadcasts at 420.5 m wavelength. Given the speed of radio waves 3 x 108 m s^-1. Calculate the frequency at which the radio station broadcasts its programme
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1
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7104
|
July 1, 2016
|
|
For hearing the loudest ticking sound by the ear. (a) Find the angles x and y in the figure below. (b) Name the phenomenon observed here. (c) State the laws of the phenomenon
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0
|
2502
|
July 1, 2016
|
|
(a) What is reverberation? Write two ways of reducing reverberation. (b) Distinguish between tone and note. (c) With the help of a simple diagram, explain how defects in a metal block can be detected using ultrasound
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0
|
3018
|
July 1, 2016
|
|
(a) Write two points of difference between sound wave and light wave
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1
|
5172
|
July 1, 2016
|
|
Represent graphically two separate diagrams in each case: (a) Two sound waves having same amplitude but different frequencies
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|
1
|
11507
|
July 1, 2016
|
|
(a) List in tabular form to distinguishing features between longitudinal waves and transverse waves. Give an example of each. (b) State and define characteristics associated sound waves
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|
0
|
7787
|
July 1, 2016
|
|
(i) Which property of sound wave determines : (a) loudness (b) pitch ? (ii) A SONAR station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water is 1440 m s^-1)
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1
|
759
|
July 1, 2016
|
|
(a) How the sound propagated through the medium ? (b) Show a sound wave in graphic form and mention crest, trough, wavelength and amplitude of the wave in it. (c) Why the sound waves are called longitudinal waves?
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0
|
2330
|
July 1, 2016
|
|
Define the following terms and state their SI units : (a) Wavelength (b) Time period (c) Amplitude. Establish the relation V = vk, where the symbols have their usual meanings
|
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0
|
4311
|
July 1, 2016
|
|
Draw a labelled diagram of auditory parts of human ear and explain how the human ear works
|
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0
|
11465
|
July 1, 2016
|
|
(a) What is meant by intensity of sound ? (b) Mention the conditions for an echo to be heard clearly
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1
|
1084
|
July 1, 2016
|
|
(a) Mention two practical applications of reflection of sound waves. (b) How is the pressure variation in a sound wave amplified in human ear?
|
|
1
|
1093
|
July 1, 2016
|
|
Answer the following: (i) Can transverse waves travel in gases ? (ii) Can longitudinal waves travel in solid, liquid as well as gas ? (iii) At any instant a compression is formed at a point
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1
|
1051
|
July 1, 2016
|
|
The sound of an explosion on the surface of lake is heard by a boatman 100 m away and a diver 100 m below the point of explosion
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|
1
|
3599
|
July 1, 2016
|
|
How does the sound produced by a musical instrument, reach your ears? Astronauts need radio transmitter to talk to each other on moon. Why?
|
|
0
|
2468
|
July 1, 2016
|
|
(a) The sound of which of the following frequencies are audible' to human ears : 2 Hz, 5 Hz, 20 Hz, 200 Hz, 2000 Hz. (b) How moths of certain families are able to escape capture?
|
|
0
|
925
|
July 1, 2016
|
|
Draw the sound waves for a low pitched and the high pitched sound. Write one use of ultrasonography. Which wave property determines pitch?
|
|
0
|
12322
|
July 1, 2016
|
|
"A sound wave with frequency higher than 20 kHz is not audible for human ear". Answer thefollozving in respect of this statement: (i) What is the term used for such a sound 1 (ii) Name two organisms producing sound in this range
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|
1
|
976
|
July 1, 2016
|
|
(a) What is the cause of sensation of sound due to rolling of thunder ? (b) Give the audible range of human ear. (c) What are infrasonic and ultrasonic waves?
|
|
0
|
1681
|
July 1, 2016
|
|
What is an echo? When can we distinctly hear the echo of a sharp sound ? Why cannot we hear an echo in n small halls?
|
|
0
|
3378
|
July 1, 2016
|
|
Define the following characteristics of sound: (a) (i) Pitch (ii) Loudness (iii) Quality or Timbre (b) A boy receives his echo 3 s later. Find the distance of the reflecting surface from the boy. Speed of sound in air is 342 m s^-1
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|
0
|
1722
|
July 1, 2016
|
|
A ship sends out returns from the ultrasound that seabed is detected after 4 s. If the speed of ultrasound through sea water is 1550 m s^-1, find the distance of the seabed from the ship
|
|
0
|
436
|
July 1, 2016
|
|
What is a SONAR ? For what it is used? Explain inbrief its working
|
|
0
|
4485
|
July 1, 2016
|
|
Why are sound waves called mechanical waves ? List two practical applications of reflection of these waves
|
|
1
|
3194
|
July 1, 2016
|
|
(a) A mobile ringing inside a vacuum chamber cannot be heard outside. Why ? (b) Represent transverse wave graphically. (c) What is meant by loudness of sound ? On what factor does it depend?
|
|
0
|
958
|
July 1, 2016
|
|
What is audible range of the average human ear ? Explain how ultrasound is used to clean spiral tubes and electronic components?
|
|
0
|
728
|
July 1, 2016
|
|
(a) A boy strikes one end of a long pipe with a stone. Another boy who keeps his ear close to the other end of pipe heard two soundsjn a short interval of time. Explain, why. (b) List two uses of ultrasonics
|
|
0
|
2986
|
July 1, 2016
|
|
Define echo. Establish a mathematical relation between speed of sound, distance of reflecting body from source of sound and time for echo
|
|
0
|
2001
|
July 1, 2016
|
|
State the relationship between frequency and time period of a wave. The wavelength of vibrations produced on the surface of water is 2 cm. If the wave velocity is 16 m s^-1, find its frequency and time period
|
|
0
|
3114
|
July 1, 2016
|
|
Define frequency, amplitude and speed of a sound wave
|
|
0
|
5163
|
July 1, 2016
|