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प्रश्न
Why are the Ultrasonic waves are not audible to us?
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उत्तर
Ultrasonic waves have frequency larger than 20000 Hz. Hence, these waves are not audible to us as the audible range of the human ear is 20 Hz to 20000 Hz.
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संबंधित प्रश्न
Give one reason for Ultrasonic waves use for echo depth sounding purpose.
What do you understand by free vibrations of a body?
- Name one factor on which the frequency of sound emitted due to vibrations in an air column depends.
- How does the frequency depend on the factor stated in part (a).
State two ways of increasing the frequency of vibrations of a stretched string.
A blade, fixed at one end, is made to vibrate by pressing its other end and then releasing it. State one way in which the frequency of vibrations of the blade can be lowered.
Two astronauts cannot hear each other on the moon. Why?
(a) Which one of the following graphs A or B shows free vibrations in a vacuum and which one shows free vibrations in a medium?
(b) How did you come to this conclusion.
Where can a body execute natural vibrations?
