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प्रश्न
Which of the following statement best describes frequency?
पर्याय
the maximum disturbance caused by a wave
the number of complete vibrations per second
the distance between one crest of a wave and the next one
the distance travelled by a wave per second
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उत्तर
Frequency is defined as number of complete vibrations per second.
(b) Number of complete vibrations per second.
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संबंधित प्रश्न
What is meant by an echo?
Which property of sound leads of the formation of echoes ?
Name three devices which work on the reflection of sound.
Name any two objects which are good reflectors of sound.
What is an echo ? How is echo formed ?
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method ?
Answer the following question in your own words.
What is an echo?
State two conditions necessary for hearing an echo.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
