Advertisements
Advertisements
प्रश्न
Why are the Ultrasonic waves are not audible to us?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Give one reason for Ultrasonic waves use for echo depth sounding purpose.
State one condition for a body to execute free/natural vibrations.
- 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).
Explain why strings of different thicknesses are provided on a stringed instrument.
[Hint: Natural frequency of vibration of a stretched string is inversely proportional to the radius (or thickness) of string so notes of different frequencies can be produces by vibrating different strings.]
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.
Explain why does a wine glass starts rattling, when a note of some particular frequency is struck by a piano?
Where can a body execute natural vibrations?
