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The town hall 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.
 
We know that speed, pitch, loudness all are initiated with a .
 
During the day time, there is  around us. So, the sound coming from the clock  and amplitude of vibrations becomes .
 
But during the night time, there are  in the environment. So, sound is more clear.