Question

PLZ HELP

A wave has a wavelength of 4.9 m and a velocity of 9.8 m/s. The medium through which this wave is traveling is then heated so that the velocity is doubled.

If the frequency remains constant, what is the wavelength of the heated wave?

2.5 m
9.8 m
14.7 m
19.6 m

Answer 1

B on Edge

Step-by-step explanation:

Took the test

Answer 2

Answer: the wavelenght is 9.8 meters

Step-by-step explanation:

We can use the relationship:

Velocity = wavelenght*frequency.

Initially we have:

wavelenght = 4.9m

velocity = 9.8m/s

then:

9.8m/s = 4.9m*f

f = 9.8m/s/4.9m = 2*1/s

now, if the velocity is doubled and the frequency remains the same, we have:

2*9.8m/s = wavelenght*2*1/s

wavelenght = (2*9.8m/s)*(1/2)s = 9.8 m