Question

Two sound waves in air have wavelength ratio 1:3. Calculate their frequency

Answer 1

frequency and wavelength are inversely proportional. so the ratio will be 3:1

Answer 2

Answer:

¥ (taken to be wavelength)

¥=vt

[t=1/f]

¥=v/f

v is constant as travelling in same medium

therefore, ¥=1/f

¥1=1(given)

¥2=3(given)

HENCE, f1=1/¥1

=1/1...............【¡】

f2=1/¥2

=1/3..............【¡¡】

Combining equation ¡&¡¡

f1:f2 = 1/1 : 1/3

= 3:1

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