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प्रश्न
Two astronauts cannot hear each other on the moon. Why?
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उत्तर
Material medium is necessary for the propagation of sound. On the moon there is a vacuum, i.e. no air, therefore sound cannot propagate on the moon. Thus the astronauts can not hear each other.
संबंधित प्रश्न
What do you understand by free vibrations of a body?
On What factors does the natural frequency of vibration of a body depend?
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).
State one way of increasing the frequency of a note produced by an air column.
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?
