Advertisements
Advertisements
Question
Two astronauts cannot hear each other on the moon. Why?
Solution
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.
APPEARS IN
RELATED QUESTIONS
Why are the Ultrasonic waves are not audible to us?
State one condition for a body to execute free/natural vibrations.
State one way of increasing the frequency of a note produced by an air column.
State two ways of increasing the frequency of vibrations of a stretched string.
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.
Define the term Amplitude.
(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.
