Compare the quantity of heat energy required to raise the temperature of water by a certain amount with the heat required to raise the temperature of same iron by same amount.

(Given:$C_{iron}=450 \mathrm{J} \mathrm{kg}{ }^{-1} {\mathrm{K}}^{-1}, C_{water}=4200 \mathrm{J} \mathrm{kg}{ }^{-1} {\mathrm{K}}^{-1}$)

A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of air column.

What is the name of the phenomenon taking place when this happens?

A vibration tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of air column.

Why does the sound become the loudest?

A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of air column.

What is the name of the phenomenon taking place when sound is produced for another length of air column and is not the loudest?