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.
We have a stringed musical instrument. The string is plucked in
the middle first with a force of greater magnitude and then with
a force of smaller magnitude. In which case would the instrument
produce a louder sound?
Two astronauts are floating close to each other in space. Can
they talk to each other without using any special device? Give
reasons.
Suppose a stick is struck against a frying pan in vacuum. Will
the frying pan vibrate? Will we be able to hear the sound? Explain.
We have learnt that vibration is necessary for producing sound.
Explain why the sound produced by every vibrating body cannot
be heard by us?
A simple pendulum makes 10 oscillations in 20 seconds. What
is the time period and frequency of its oscillation?
+91 94284 01196 (WhatsApp only)
C-15, Suvidhapark Society, Amitnagar circle, Karelibaug, Vadodara (390018)
© Copyright 2025. Doubtora. All Rights Reserved
