Class XI

There are three sources of sound of equal intensities with frequencies 400, 401 and 402 Hz. The number of beats per seconds is
  1. 0
  2. 1.0
  3. 3
  4. 2
The velocity of sound in gas in which two waves of wavelength 1.0 m and 0.01 m produces 4 beats/sec. is
  1. 404 m/s
  2. 1010 m/s
  3. 360 m/s
  4. 440 m/s
A fork of unknown frequency when sounded with another fork of frequency 256 Hz produces 4 beats/sec. The first fork is loaded with wax. It again produces 4 beats/sec. When sounded together with the fork of 256 Hz frequency, then the frequency of first tuning fork is
  1. 252 Hz
  2. 252 or 260 Hz
  3. 260Hz
  4. None of these
The speed of propagation of a sinusoidal wave is given by V=νλV=νλ where
  1. νν is the reciprocal of the period and λλ is the wave number
  2. νν is the reciprocal of the period and λλ is the dispersion
  3. νν is the angular frequency and λλ is the wavelength
  4. νν is the reciprocal of the period and λλ is the wavelength
Two tuning forks of frequencies 250 Hz produce beats. If a maximum is produced just now, after how much time the minimum is produced at the same place
  1. 123s
  2. 138s
  3. 118s
  4. 11438s
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