How does a vibrating tuning fork produce sound waves?                                            

Give two differences between free and forced vibrations.

Define the terms Intensity and loudness

Define the terms frequency and pitch

Define the terms timbre and waveform of sound.

An observer stands at a distance of $850 \mathrm{m}$ from a cliff and fires a gun. After how much time he hears an echo, if the speed of sound in air is $340 \mathrm{m} {\mathrm{s}}^{-1}$.

A vibrating tuning fork is placed over the mouth of the burette filled with water. The tap is opened and the water level gradually falls, it is found that the sound becomes very loud for some particular length of water column. State the name of phenomenon taking place when this happens.

A vibrating tuning fork is placed over the mouth of the burette filled with water. The tap is opened and the water level gradually falls, it is found that the sound becomes very loud for some particular length of water column. Why does the sound become very loud?

What change, if any, would you expect in the characteristics of musical sound, when we increase Its frequency.