Waves and Sound
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Questions and Answers

When a wave travels from a denser to a rarer medium, what happens to the phase of the reflected wave?

  • The phase of the reflected wave changes by π/2
  • The phase of the reflected wave does not change
  • The phase of the reflected wave changes by 2π
  • The phase of the reflected wave changes by π (correct)

    • What is the condition for constructive interference of sound waves?

  • Waves must have different frequencies
  • Waves must have the same frequency and wavelength (correct)
  • Waves must have different velocities
  • Waves must have different amplitudes

    • What is the ratio of the amplitudes of the reflected and incident waves at a free boundary?

  • k1 - k2 / k1 + k2 (correct)
  • v1 - v2 / v1 + v2
  • v1 + v2 / v1 - v2
  • k1 + k2 / k1 - k2

    • What is the result of the superposition of two waves that differ in direction?

    <p>Formation of stationary waves</p> Signup and view all the answers

    What is the name of the figure formed by the superposition of two perpendicular simple harmonic motions?

    <p>Lissajous figure</p> Signup and view all the answers

    What is the minimum distance required for an echo to be heard for a short sound, given that the speed of sound is 340 m/s?

    <p>17 m</p> Signup and view all the answers

    What happens to a longitudinal pressure wave when it reflects from a rigid end?

    <p>It suffers no change in phase</p> Signup and view all the answers

    What is the principle of superposition of waves?

    <p>The displacement at any time is the vector sum of the individual displacements</p> Signup and view all the answers

    What happens to a longitudinal pressure wave when it reflects from a free end?

    <p>It suffers a phase change of π</p> Signup and view all the answers

    What is an echo?

    <p>A repetition of the speaker's own voice caused by reflection at a nearby surface</p> Signup and view all the answers

    What is the form of the equation of a stationary wave when reflection takes place from a rigid end?

    <p>y = 2a sin ωt cos kx</p> Signup and view all the answers

    What is the condition for the amplitude of a stationary wave to be maximum?

    <p>cos kx = ±1</p> Signup and view all the answers

    What is the characteristic of a wave that satisfies the wave equation but is not progressive?

    <p>It has a constant phase at all points</p> Signup and view all the answers

    What is the result of the superposition of two waves y1 = a sin(ωt - kx) and y2 = a sin(ωt + kx)?

    <p>y = 2a cos kx sin ωt</p> Signup and view all the answers

    What is the characteristic of the amplitude of vibration of particles in a stationary wave?

    <p>It varies from zero at nodes to maximum at antinodes</p> Signup and view all the answers

    What is the physical quantity that the wave velocity depends on?

    <p>Properties of the medium</p> Signup and view all the answers

    What is the phase of a particle in a wave motion?

    <p>The quantity that expresses the displacement of the particle and its direction of motion</p> Signup and view all the answers

    What is the relationship between the wave function y and the distance travelled by the wave pulse vt?

    <p>y = f(x - vt)</p> Signup and view all the answers

    What is the group velocity of a wave?

    <p>The velocity with which the group of waves travels</p> Signup and view all the answers

    What is the condition for two particles to be in the same phase?

    <p>They must be at the same distance in the same direction from their equilibrium positions</p> Signup and view all the answers

    What is the physical significance of the slope of the wave at a given point?

    <p>It represents the maximum particle velocity at that point.</p> Signup and view all the answers

    What is the relationship between the angular frequency ω and the time period T of a wave?

    <p>ω = 2π/T</p> Signup and view all the answers

    What is the direction of propagation of a wave if the sign between the t and x terms is negative?

    <p>Positive X-axis direction</p> Signup and view all the answers

    What is the relationship between the maximum particle velocity (vp)max and the angular frequency ω of a wave?

    <p>(vp)max = aω</p> Signup and view all the answers

    What is the characteristic of a medium in which the speed of wave is less than the speed of wave in another medium?

    <p>It is a denser medium.</p> Signup and view all the answers

    What is the apparent frequency when the source and observer are moving towards each other?

    <p>n(v - vS)/v</p> Signup and view all the answers

    What is the velocity of the wave with respect to the observer when the source and observer are moving towards each other?

    <p>v + vO - vS</p> Signup and view all the answers

    What is the apparent wavelength when the source is moving away from the observer?

    <p>λ(v - vS)/v</p> Signup and view all the answers

    What is the direction of velocity v in the figure shown?

    <p>From source to observer</p> Signup and view all the answers

    What is the sign convention used for velocities in the direction of v?

    <p>Positive</p> Signup and view all the answers

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