Question Text
Question 1 :
We find it difficult to hear if we put cotton in our ears. This is because
Question 3 :
<p>When the sound waves reach the ________, it starts vibrating :<br/></p>
Question 6 :
The total energy of sound waves E is related to their frequency n as
Question 12 :
What is an approximate value for the speed of sound in air?
Question 13 :
A hollow iron pipe is being hammered is heard at the other end at an interval of 0.5s, what is the length of iron pipe, if speed of sound in air is 320 m s$^{-1}$ and that in iron is 4320 m s$^{-1}$?<br/>
Question 16 :
<p>Speed of sound is greater in solids than in gases. Because :<br/></p>
Question 20 :
<p>Which of the following frequency of sound can be heard by a dog but not by a man?</p>
Question 21 :
The characteristics of sound which enables us to distinguish two musical sounds coming from different sources but having the same frequency and loudness is :<br/>
Question 24 :
SONAR is an instrument used for finding the heights of a mountain.