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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.
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).
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.]
Define the term Amplitude.
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.
Where can a body execute natural vibrations?
