Question

What is the relation between speed of sound, wavelength and its frequency? (I Prefer Proper Explanation)

Answer 1

Speed of sound = V
Wavelength of sound = λ
Frequency of sound = f

Relation,

V= λf

This is due to the dependence of velocity and Wavelength ( Directly proportional).
Value of f remains constant for a source, so, it is the proportionality constant.

V ∝ λ
V = f λ

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Answer 2

Speed of sound = V 
Wavelength of sound = λ
Frequency of sound = f 

Relation, 

V= λf 

This is due to the dependence of velocity and Wavelength ( Directly proportional). 
Value of f remains constant for a source, so, it is the proportionality constant. 

V ∝ λ
V = f λ