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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
Give one reason for Ultrasonic waves use for echo depth sounding purpose.
Draw a graph between displacement and the time for a body executing free/natural vibrations.
On What factors does the natural frequency of vibration of a body depend?
- 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.]
Explain why does a wine glass starts rattling, when a note of some particular frequency is struck by a piano?
Explain why strings of different thicknesses are provided on a stringed instrument.
(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.
