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Waves

Class 11 · Physics · 5 questions

Name: ____________________   Date: ____________

  1. The speed of a wave of frequency 100 Hz and wavelength 3.4 m is:

    • A 340 m/s
    • B 3.4 m/s
    • C 34 m/s
    • D 103.4 m/s

  2. The beat frequency of two sources of 256 Hz and 260 Hz is:

    • A 2 Hz
    • B 4 Hz
    • C 258 Hz
    • D 516 Hz

  3. In a stationary wave the points of zero amplitude are:

    • A Wavefronts
    • B Nodes
    • C Crests
    • D Antinodes

  4. The Doppler effect is a change in the observed:

    • A Mass
    • B Amplitude only
    • C Frequency due to relative motion
    • D Speed of light

  5. The fundamental frequency of a string of length L and wave speed v fixed at both ends is:

    • A 2 v / L
    • B v / 2L
    • C v / L
    • D v L

Answer key

1. A, 2. B, 3. B, 4. C, 5. B

  1. v = f x wavelength = 340 m/s.

  2. Beat frequency = difference = 4 Hz.

  3. Nodes are the points where the amplitude is zero.

  4. Relative motion of source and observer changes the observed frequency.

  5. The string holds half a wavelength: f = v / 2L.