When the wire of a guitar is plucked
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2
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4266
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February 2, 2019
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Sketch larynx and explain its function in your own words
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0
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29416
|
March 22, 2018
|
What is the difference between noise and music? Can music become noise sometimes?
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0
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987
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March 22, 2018
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Suggest four measures to limit noise pollution in your locality
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0
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1385
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March 22, 2018
|
How is sound produced and how is it transmitted and heard by us?
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0
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4633
|
March 22, 2018
|
List sources of noise pollution in your surroundings
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0
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9302
|
March 22, 2018
|
Your parents are going to buy a house
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0
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664
|
March 22, 2018
|
Explain in what way noise pollution is harmful to humans
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0
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1204
|
March 22, 2018
|
We have a stringed musical instrument. The string is plucked in the middle first with a force of greater magnitude and then with a force of smaller magnitude
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0
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4722
|
March 22, 2018
|
An alarm bell is kept inside a vessel as shown in the figure below
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0
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6454
|
March 22, 2018
|
Identify the part which vibrates to produce sound in the following instruments
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0
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850
|
March 22, 2018
|
The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?
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0
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2497
|
March 22, 2018
|
A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency
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0
|
1267
|
March 22, 2018
|
Two astronauts are floating close to each other in space. Can they talk to each other without using any special device? Give reasons
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0
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2143
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March 22, 2018
|
Suppose a stick is struck against a frying pan in vacuum. Will the frying pan vibrate?
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0
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2586
|
March 22, 2018
|
We have learnt that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heard by us
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0
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773
|
March 22, 2018
|
A simple pendulum makes 10 oscillations in 20 seconds. What is the time period and frequency of its oscillation?
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0
|
1934
|
March 22, 2018
|
Figure shows a loudspeaker cone oscillating to produce sound waves:
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0
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3513
|
March 21, 2018
|
Represent graphically any two separate diagrams in each case:
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0
|
728
|
March 21, 2018
|
What is meant by reflection of sound?
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0
|
889
|
March 21, 2018
|
Give reasons for the following: The reverberation time of a hall used for speeches should be very short
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0
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2908
|
March 21, 2018
|
State an approximate value for the speed of sound in air
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0
|
1786
|
March 21, 2018
|
A girl is sitting in the middle of a park of dimension 12 m X 12 m
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0
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5031
|
March 21, 2018
|
In the graphs given below representing the human voice, which of the two graphs or is likely to be the male voice? Give reason for your answer
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0
|
3175
|
March 21, 2018
|
What is a sound board?
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0
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4147
|
March 21, 2018
|
Write full form of acronym SONAR. Explain how the method of echo- ranging is used to determine the depth of sea
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0
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3041
|
March 21, 2018
|
Draw diagrams to represent soft sound and loud sound
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0
|
2621
|
March 21, 2018
|
. Plot the following: A longitudinal wave in air on a density-distance graph. A transverse wave on a displacement-distance graph
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0
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4458
|
March 21, 2018
|
Which wave characteristics determine the loudness pitch of sound?
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|
0
|
2090
|
March 21, 2018
|
Prove that u=vλ, where the symbols have their usual meanings
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0
|
6640
|
March 21, 2018
|