Question:
Source of sound and the observer are mutually at rest. If the speed of sound is changed, then the frequency of sound heard by the observer will appear to be
Source of sound and the observer are mutually at rest. If the speed of sound is changed, then the frequency of sound heard by the observer will appear to be
Updated On: Apr 29, 2024
- increased
- decreased
- unchanged
- decreasing exponentially
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The Correct Option is C
Solution and Explanation
The apparent change in the frequency of the source due to a relative motion between the source and observer is known as Doppler's effect.
The perceived frequency is given by $f'=f\left(\frac{v-v_{o}}{v-v_{s}}\right)$ where $f$ is original frequency, $v$ the speed of sound, $v_{o}$ of observer, $v_{s}$ the speed of source.
In the given case there is no relative motion between source and observer,
since both are at rest, hence frequency of sound heard by the observer will remain unchanged.
The perceived frequency is given by $f'=f\left(\frac{v-v_{o}}{v-v_{s}}\right)$ where $f$ is original frequency, $v$ the speed of sound, $v_{o}$ of observer, $v_{s}$ the speed of source.
In the given case there is no relative motion between source and observer,
since both are at rest, hence frequency of sound heard by the observer will remain unchanged.
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The waves that are produced when an electric field comes into contact with a magnetic field are known as Electromagnetic Waves or EM waves. The constitution of an oscillating magnetic field and electric fields gives rise to electromagnetic waves.
Types of Electromagnetic Waves:
Electromagnetic waves can be grouped according to the direction of disturbance in them and according to the range of their frequency. Recall that a wave transfers energy from one point to another point in space. That means there are two things going on: the disturbance that defines a wave, and the propagation of wave. In this context the waves are grouped into the following two categories:
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