Question

HC Verma : Question No. 6

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Answer 1

Hey !!
Kindly ignore the pic !!

Here is your answer !!

Speed of the soundwave in air=340m/s
Frequency = 20kHz = 20000Hz
Wavelength = 340/20000
= 0.017m
= 0.017×100 cm = 1.7cm

Speed of sound wave in water = 1480m/s
Frequency same = 20000Hz

wavelength = 1480/20000
= 0.074 m = 7.4cm

Hope it helps you !

Answer 2

$here \: is \: your \: answer \: brother \\ speed \: of \: the \: sound \: wave \: in \: air \: = 340m/s \\ \\frequency \: = 20kHz = 20000Hz \\ \\ wave \: lenght = \frac{340}{2000} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 0.017m \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 0.017 \times 100 = 1.7cm \\ \\ speed \: wave \: in \: water = 148m /s \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:freqence \: are = 20000Hz \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: wave \: lenght = \frac{1480}{20000} = 0.074m = 7.4cm \\ \\ i \: hope \: you \: understand \: bhai$