Class XI

A tuning fork of frequency 500 Hz is sounded on a resonance tube. The first & second resonances are obtained at 17 cm and 52 cm. The velocity of sound in m/s is 520
  1. A tuning fork of frequency 500 Hz is sounded on a resonance tube. The first & second resonances are obtained at 17 cm and 52 cm. The velocity of sound in m/s is 520
  2. 850
  3. 170
  4. 350.0
A travelling wave, at a rigid boundary or a closed end,
  1. is reflected with same phase
  2. is reflected with a phase difference of 30∘
  3. is reflected with a phase reversal
  4. is reflected with a phase difference of 70∘
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
An observer is watching two vehicles of same velocity ( 4 m/s). The former is approaching towards the observer while the latter is receding. If the frequency of the siren of the vehicle is 240 Hz and velocity of sound in air is 320 m/s , then the beats produced is
  1. 12
  2. 6.0
  3. zero
  4. 3
When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave. This is known as
  1. the Huygens principle for waves
  2. the principle of reciprocity of waves
  3. the principle of superposition of waves
  4. the principle of conservation of waves
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