Question

What is the speed of a wave with a wavelength of 4 cm and a frequency of 4 hertz

Answer 1

frequency of wave = speed/wavelength
frequency= 4 Hz
wavelength= 4/100 = 0.04 m
speed = 0.04×4 = 0.16 m/sec

Answer 2

Hey.

Here is the answer.

Wavelength = 4 cm
Frequency = 4 Hz = 4 s ^-1

as frequency = 1/ time period
so, 4 Hz =1/ T
so, T = 1/4 = s

Speed = wavelength / Time period
so, speed of the wave = 4cm / 1/4 sec = 16cm/s

Also, speed of wave = frequency× wavelength
= 4×4 =16 cm/s = 0.16× 10 ^-2 m/sec

Thanks.