Question

A certain wave has a wavelength of 35 meters and a frequency of 4.0 Hz. What is the speed of the wave?

A) 8.8 m/s
B) 31 m/s
C) 39 m/s
D) 140 m/s

Answer 1

speed of a wave is the wavelength * frequency

speed = 35 * 4 = 140 m/s

Answer 2

The correct answer is option D.

Step-by-step explanation:

Wavelength of the wave =
`\lambda` =35 m

Frequency of the wave = f = 4.0 Hz

Time taken by the wave = T

`T=(1)/(frequency)=(1)/(4.0 Hz)=0.25 s`

Speed of the wave:

`Speed=(35 m)/(0.25 s)=140 m/s`

Hence, the correct answer is option D.