Question Text
Question 1 :
The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?
Question 3 :
Does the frequency of the voice of a child is higher than that of an adult?
Question 4 :
The townhall building is situated close to Boojho’s house. There is a clock on the top of the townhall building which rings the bell every hour. Boojho has noticed that the sound of the clock appears to be much clearer at night. Explain.
Question 5 :
When sound enters into ear, it travels down a canal at the end of which there is a thin stretched membrane. It is called the __________.
Question 6 :
State True or False: Noise pollution may cause partial hearing impairment.
Question 7 :
Lightning and thunder take place in the sky at the same and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain why?
