Question

A sound source sends waves of $400Hz$. It produces waves of wavelength $2.5m$. The velocity of sound waves is:

• A. $100m{s}^{-1}$
• B. $1000m{s}^{-1}$
• C. $200m{s}^{-1}$
• D. $2000m{s}^{-1}$

Answer 1

The correct option is B

$1000m{s}^{-1}$

Speed of a wave is:
$v=f\times \lambda$
where:
$f:$ Frequency
$\lambda :$ Wavelength

$v=400\times 2.5$
$v=1000m{s}^{-1}$