Question:

An engine is moving on a circular path of radius $100\, m$ with a speed of $20\, m/s$. What will be the frequency observed by an observer standing stationary at the centre of circular path when the engine blows a whistle of frequency $500\, Hz$?

Updated On: Jul 12, 2022
  • More than 500 Hz
  • Less than 500 Hz
  • 500 Hz
  • No sound is heard
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The Correct Option is C

Solution and Explanation

As motion of the source is always perpendicular to the direction of propagation of sound, so there will be no Dopplers effect.
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Concepts Used:

Waves

Waves are a disturbance through which the energy travels from one point to another. Most acquainted are surface waves that tour on the water, but sound, mild, and the movement of subatomic particles all exhibit wavelike properties. inside the most effective waves, the disturbance oscillates periodically (see periodic movement) with a set frequency and wavelength.

Types of Waves:

Transverse Waves -

Waves in which the medium moves at right angles to the direction of the wave.

Examples of transverse waves:

  • Water waves (ripples of gravity waves, not sound through water)
  • Light waves
  • S-wave earthquake waves
  • Stringed instruments
  • Torsion wave

The high point of a transverse wave is a crest. The low part is a trough.

Longitudinal Wave -

A longitudinal wave has the movement of the particles in the medium in the same dimension as the direction of movement of the wave.

Examples of longitudinal waves:

  • Sound waves
  • P-type earthquake waves
  • Compression wave