Question

The physical quantities that remain unchanged after reflection of a sound wave are:

Why is it so?

Answer 1

Wavelength, frequency and speed of the sound waves remain the same.

These quantities remain same because reflection is bouncing of a wave in to the same medium. As because the medium remains same velocity remains same. Now velocity of a sound wave is related to its frequency and wavelength by the relation V = νλ. Now as V is constant product of frequency and wavelength too remains constant. Then frequency of sound depends on the time period of the oscillator that generates the sound thus frequency does not change. As frequency and velocity does not change, wavelength too remains constant.

Answer 2

physical quantities that remain unchanged after reflection of a sound wave are wavelength, frequency and speed of the sound.

Why is it so?

• These amounts stay the same since reflection is the bobbing of a wave into a similar medium.
• Given that the medium's following parts run at the same pace, the result is the same.
• The connection between these three is Currently  V = νλ, V is a constant outcome of wavelength, and frequency is also constant.
• Then, at that point, the wavelength of sound relies upon the period of the oscillator that creates the sound subsequently recurrence doesn't change.
• As wavelength and velocity don't change, frequency also stays steady.

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