# Nootan Solutions Doppler Effect ISC Physics Class-11 Ch-30

Nootan Solutions Doppler Effect ISC Physics Class-11 Ch-30 Vol-2 Nageen Prakashan.  Step by step Solutions of Numericals of latest edition of Kumar and Mittal ISC Physics Part-2 Class-11 Nageen Prakashan Questions. Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

## Nootan Solutions Doppler Effect ISC Physics Class-11 Ch-30

 Class: 11 Subject: Physics Part-2 Chapter: 30 Doppler Effect
 Board ISC Writer / Publications Nootan / Nageen Prakashan / Kumar and Mittal Topics Solved Numericals of page 1059

### Nootan Solutions Doppler Effect ISC Physics Class-11 Ch-30 Vol-2 Kumar and Mittal

#### Doppler Effect :-

Doppler effect is an important phenomenon that is useful in a variety of different scientific disciplines, including planetary science. The Doppler effect or the Doppler shift describes the changes in the frequency of any kind of sound or light wave produced by a moving source with respect to an observer.
“” Doppler effect in physics is defined as the increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other “”.
Waves emitted by a source travelling towards an observer gets compressed. In contrast, waves emitted by a source travelling away from an observer get stretched out. Doppler Effect was first proposed by Christian Johann Doppler in 1842.

#### Doppler Effect :-

According to Doppler’s effect, whenever there is a relative motion between a source of sound and listener, the apparent frequencies of sound heard by the listener is different from the actual frequency of sound emitted by the source.
For sound the observed frequency v’ is given by

#### Doppler Effect Uses :-

Many mistake the Doppler effect to be applicable only for sound waves. It works with all types of waves including light. Below, we have listed a few applications of the doppler effect:

• Medical Imaging
• Blood Flow Measurement
• Satellite Communication
• Vibration Measurement
• Developmental Biology
• Sirens
• Astronomy
• Audio
• Velocity Profile Measurement

#### Limitations of Doppler Effect  :-

• Doppler Effect is applicable only when the velocities of the source of the sound and the observer are much less than the velocity of sound.
• The motion of both source and the observer should be along the same straight line.

#### Doppler Effect In Light :-

Doppler effect of light can be described as the apparent change in the frequency of the light observed by the observer due to relative motion between the source of light and the observer.
For sound waves, however, the equations for the Doppler shift differ markedly depending on whether it is the source, the observer, or the air, which is moving. Light requires no medium, and the Doppler shift for light travelling in a vacuum depends only on the relative speed of the observer and source.

Nootan Solutions Doppler Effect ISC Physics Class-11 Ch-30

(Page 1059)

Question 1:

A sound source …………………….. in opposite direction.

Question 2:

An engine ………………. 340 m/sec.

Question 3:

…………………………

………………………….

…………………………..

Question 15:

A siren ………………………………. wall ?

Question 16:

A whistling engine …………………….. by him .

Question 17:

A table ……………………….. 352 m/sec.

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-: End of Doppler Effect Ch 30 Nootan Solutions :-

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