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Waves Test - 4

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Waves Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which one is not produced by sound waves in air?

    Solution

    Sound waves are longitudinal, meaning that they oscillate parallel to the direction of their motion. Since there is no component of a sound wave's oscillation that is perpendicular to its motion, sound waves cannot be polarized.

  • Question 2
    1 / -0

    Longitudinal waves cannot be propagated through

    Solution

    Longitudinal waves are mechanical waves. They travel due to pressure diffrence created by waves in medium. In vacuum they cannot create pressure difference. Thus they cannot travel in vacuum.

  • Question 3
    1 / -0

    When a wave is reflected from a rigid surface, it undergoes a phase change given by

    Solution

    When a wave travel from rarer medium to denser medium and undego reflection at interface. Its phase changes by π.

  • Question 4
    1 / -0

    Two persons cannot hear each other on the surface of moon because the moon has

    Solution

    Sound waves are mechanical waves. They need a medium to travel. As there is no atmosphere sound waves cannot travel. Thus one cannot hear another person.

  • Question 5
    1 / -0

    When sound travels from air to water the quantity that remains unchanged is

    Solution

    When a wave travel from one medium to another only the velocity and wavelength changes in such a way that its frequency remains constant.

  • Question 6
    1 / -0

    Beats can only be heard when the difference in frequencies is less than

    Solution

    For beats to be audible the frequency |f1-f2| should not be very large.an average human ear cannot distinguish the variation in intensity if the variation is more than 16 times per second.

    Thus the difference of the component frequency should be less than 16 Hz for beats to be heard.

  • Question 7
    1 / -0

    Stationary waves of frequency 200 are formed in air. If velocity of the wave is 360m/s the shortest distance between antinodes will be

    Solution

    Distance between two antinodes will be equal to the wave length of wave

    λ = c/f = 360/200

    λ = 1.8m

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