With respect to sound waves, which of the following statements are correct ?

(1) The maximum displacement of a particle on either side of its mean position is called the amplitude of the wave.

(2) Time taken by the particle of a medium to complete one vibration is called the time period.

(3) The number of vibrations made by the particle of a medium in one second is called the frequency.

(4) The frequency of a wave is different than the frequency of the source producing it.

1. 1
2. 1, 2
3. 1, 2, 3
4. 1, 2, 3 and 4

The speed V of a longitudinal wave is given by :

1. V = $\dfrac{1}{d} \sqrt {γP}$
2. V = $\sqrt {γP}$
3. V = $\sqrt\dfrac{T}{m}$
4. V = $\sqrt\dfrac{γP}{d}$

Various types of mechanical waves are :

1. electromagnetic, longitudinal, transverse
2. electromagnetic, transverse
3. longitudinal, transverse
4. electromagnetic, transverse.

Due to vibrations of medium particles, the energy transformation is from :

1. heat energy to kinetic energy and vice versa
2. kinetic energy to potential energy and vice versa
3. heat energy to potential energy and vice versa
4. potential energy to nuclear energy and vice versa