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प्रश्न
State the approximate speed of ultrasound in air.
उत्तर
The approximate speed of ultrasound in air is 330 m/s-1.
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संबंधित प्रश्न
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
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| I | II |
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| III | IV |
Which diagram shows
- a note from a musical instrument
- a soft (or feeble) note,
- a bass (low frequency) note.
A microphone is connected to the Y-input of a C.R.O Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produces on the screen are shown in following figure.
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 |
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| (a) | (b) | (c) |
- Which trace is due to the loudest sound? Give reason for your answer.
- Which trace is due for the sound with the lowest pitch? Explain your answer.
Which has the higher frequency - ultrasonic sound or infrasonic sound?
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
What do you understand by the term ultrasonic vibrations?
Name three animals which can hear ultrasonic vibrations.
How do bats locate their prey during a flight?
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
What are infrasonic and ultrasonic sounds?
What are hearing aids?
