How many degrees of freedom the gas molecules have if, under \(\text{STP}\), the gas density \(\rho = 1.3~\text{kg/m}^3\) and the velocity of sound propagation in it is \(330~\text{ms}^{-1}\)?
1. \(3\)
2. \(5\)
3. \(7\)
4. \(8\)
The isothermal elasticity of a medium is and the adiabatic elasticity in . The velocity of sound in the medium is proportional to
1.
2.
3.
4.
1. | \(100~\text{and}~50\) | 2. | \(44~\text{and}~22\) |
3. | \(80~\text{and}~40\) | 4. | \(72~\text{and}~30\) |
The equation of plane progressive wave motion is y=a sin 2(vt-x). Velocity of particle is
(1)
(2)
(3)
(4)
A person speaking normally produces a sound of intensity 40 dB at a distance of 1 m. If threshold intensity fo r reasonable audibility is 20 dB, the maximum distance at which he can be heared clearly is:
(1) 4 m
(2) 5 m
(3) 10 m
(4) 20 m