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(Hindi) Reflection of sound wave

Lesson 10 of 21 • 2 upvotes • 10:16mins

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Rajesh Kumar

Reflection of sound wave. The reflection of sound follows the law "angle of incidence equals angle of reflection", sometimes called the law of reflection.The reflected waves can interfere with incident waves, producing patterns of constructive and destructive interference. This can lead to resonances called standing waves in rooms. It also means that the sound intensity near a hard surface is enhanced because the reflected wave adds to the incident wave, giving a pressure amplitude that is twice as great in a thin "pressure zone" near the surface. When sound waves in air (pressure waves) encounter a hard surface, there is no phase change upon reflection. That is, when the high pressure part of a sound wave hits the wall, it will be reflected as a high pressure, not a reversed phase which would be a low pressure. A positive or "high" pressure is one that is above the ambient atmospheric pressure and a negative or "low" pressure is just one that is below atmospheric pressure. A wall is described as having a higher "acoustic impedance" than the air, and when a wave encounters a medium of higher acoustic impedance there is no phase change upon reflection. On the other hand, if a sound wave in a solid strikes an air boundary, the pressure wave which reflects back into the solid from the air boundary will experience a phase reversal - a high-pressure part reflecting as a low-pressure region. That is, reflections off a lower impedance medium will be reversed in phase.

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1

Sound Wave Course Overview (in Hindi)

5:08mins

2

Nature and Propagation of Sound Wave (in Hindi)

10:19mins

3

Wavefront, displacement Wave and Pressure Wave (in Hindi)

13:10mins

4

Speed of Sound Wave in Material Medium (in Hindi)

7:14mins

5

Speed of Sound Wave in Solid and Gases (in Hindi)

8:37mins

6

(Hindi)Effect of pressure, temperature and humidity on the speed of sound in air

8:28mins

7

(Hindi) Intensity of sound wave

8:59mins

8

(Hindi) Appearance of sound to human ear

7:10mins

9

(Hindi) Interference of sound wave

10:14mins

10

(Hindi) Reflection of sound wave

10:16mins

11

(Hindi)Vibrations of air columns in closed organ pipe

7:45mins

12

(Hindi) Vibrations of air column in open organ pipe

10:47mins

13

(Hindi) Determination of speed of sound in air,Resonance Column Method

9:14mins

14

(Hindi)Kundt's tube experiment speed of sound in gas and rod

11:58mins

15

BEATS

12:36mins

16

Diffraction of sound wave

10:31mins

17

Doppler effect in sound wave.

9:58mins

18

Change in wavelength, Sonic Boom and Mach Number

9:19mins

19

Musical scale, acoustic of building, Reverberation Time, Echo

12:06mins

20

Numerical exercise no 01, based on sound wave

10:05mins

21

Numerical exercise no 02

6:21mins

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