Class XI

If y(x, t) = a sin (kx + ωωt + φφ ) represents a wave function then ‘k’ is
  1. the frequency
  2. the period
  3. the phase
  4. the angular wave number
A string when stretched with a weight of 9 kg. weight produces a note of frequency 256 Hz. The weight required to produce an octave of the note is
  1. 4 kg wt.
  2. 36 kg wt.
  3. 9/4 kg wt.
  4. 18 kg wt.
Stationary waves of frequency 200 are formed in air. If velocity of the wave is 360m/s the shortest distance between antinodes will be
  1. 1.8 m.
  2. 3.6 m
  3. 2.7 m.
  4. 0.9 m.
A wire of sonometer is 1m in length and has a fundamental frequency of 330Hz. The velocity of transverse waves along the wire is
  1. 990 m/s
  2. 115 m/s
  3. 660 m/s
  4. 300 m/s
A tuning fork produces 4 beats/sec. with 50 cm and 40 cm of a stretched wire, of a sonometer. The frequency of fork is
  1. 36 Hz
  2. 90 Hz
  3. 110 Hz
  4. 50 Hz
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