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 = $\sqrt\dfrac{γP}{d}$

The speed V of a transverse wave is given by :

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

Various types of mechanical waves are :

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