Velocity of sound is measure in hydrogen and oxygen gases at a given temperature. The ratio of the two velocities will be

If at a place the speed of a sound wave of frequency 300 Hz is V, the speed of another wave of frequency

150 Hz at the same place will be

The amplitude of sound is doubled and the frequency is reduced to one-fourth. The intensity of sound at the

same point will be

A man standing between two cliffs hears the first echo of a sound after 2 sec and the second echo 3 sec after the initial sound. If the speed of sound be 330 m/s, the distance between the two cliffs should be

An open pipe is suddenly closed with the result that the second overtone of the closed pipe is found to be higher in frequency by 100 Hz than the first overtone of the original pipe. The fundamental frequency of open pipe will be

A source of frequency f gives 5 beat/s when sounded with source of frequency 200 Hz. The second harmonic of source gives 10 beat/s when sounded with a source of frequency 420 Hz. The value of f is