Sound Class 10 ICSE Physics | Selina Chapter 7 | Reflection of Sound And Echoes

"Timestamp:
0:00 Introduction
00:31 Sound
01:23 How do we Hear Sound ?
03:34 Frequencies of Sound Waves
05:06 Mechanical Waves ( Longitudinal waves , Transversal waves )
08:40 Amplitude , Wavelength , Frequency and Timeperiod
11:17 Velocity of Longitudinal wave in Gaseous Medium
12:42 Speed of Transverse waves in a Stretched String
13:43 Difference between Light and Sound Waves
16:02 Reflection of Sound waves
20:14 Echo
24:30 Conditions for Hearing an Echo
26:52 Reverberation
28:16 Determination of Speed of sound by the method of Echo
30:15 Use of Echo
33:29 Example 1
35:50 Example 2
38:32 Example 3
41:53 Problem 1
43:54 Problem 2
45:53 Problem 3
47:38 Problem 4

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[sheenamehta]

Does the sound refracts when it passes from one medium to another ?

[sheenamehta]

Does the echo follows the same path of the transmitted sound ?

[sheenamehta]

Like dolphins, do all the fishes use ultrasonic waves to find its prey and communicate with each other ?