Question

What will happen to the sound if we add wax to a tuning fork during vibration?

Answer 1

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This is case of loaded tuning fork verses unloaded or freely able to move tuning fork.

Case 1: When tuning fork is free to move, i.e. unloaded

When tuning fork vibrates, its surface moves like transverse waves were developed on its surface.

For transverse wave, frequency of vibration varies with the mass per unit length of the medium.

mass per unit length m/l=ρm/l=ρ can be considered as inertia of medium. i.e. how much mass would oscillates about its mean position when a wave disturbance passes that length.

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Answer 2

Both vibrate with the same frequency. ... (ii) The frequency of a tuning fork decreases when it's prongs are loaded (say with wax) near the end. (iii) The frequency of tuning fork increases when prongs are filed near the ends. (iv) The frequency of a tuning fork decreases if temperature of the fork is increases.