Frequency

Q.

The frequency of sound waves can not be expressed in

1. Hz

2. cycles

3. $s^{-1}$

4. all the above

Q. In a transverse wave, a particle makes 100 ocsillations in 10 seconds. Its frequency is:

1. 100 Hz.
2. 50 Hz.
3. 10 Hz.
4. 5 Hz.

Q. The phase difference between two points separated by $0.8\text{m}$ in a wave of frequency $120\text{Hz}$ is $0.5\pi$. The wave velocity is

1. $144\text{m/s}$
2. $256\text{m/s}$
3. $384\text{m/s}$
4. $724\text{m/s}$

Q. In a sinusoidal wave, the time required for a particle to move from maximum displacement to mean position is $0.17\text{s}$. The frequency of the wave is

1. $1.47\text{Hz}$
2. $2.94\text{Hz}$
3. $4.17\text{Hz}$
4. $0.92\text{Hz}$

Q. A stone is hung in air from a wire which is stretched over a sonometre. The bridges of the sonometre are $L\text{cm}$ apart when the wire is in unison with a tuning fork of frequency $N$. When the stone is completely immersed in water, the length between the bridges is $l\text{cm}$ for re-establishing unison, the specific gravity of the material of the stone is

1. $\frac{L^2}{L^2+l^2}$
2. $\frac{L^2-l^2}{L^2}$
3. $\frac{L^2}{L^2-l^2}$
4. $\frac{L^2+l^2}{L^2}$