Question

A wave has a wavelength of 4.9 m and a velocity of 9.2 m/s. The medium through which this wave is traveling is then heated to a greater temperature.
What must be true about the frequency of this wave?

A. The frequency is less than 1.9 Hz.
B. The frequency is greater than 1.9 Hz.
C. The frequency is equal to 1.9 Hz.
D. There is not enough information to determine the frequency of this wave.

Answer 1

Answer:

B. The frequency is greater than 1.9 Hz.

Explanation:

As we know by the equation of frequency of wave

$f = \frac{v}{\lambda}$

here we know that

$speed = 9.2 m/s$

$wavelength = 4.9 m$

now from above formula we have

$frequency = \frac{9.2}{4.9} = 1.9 Hz$

now it's given that when wave is travelling then temperature of the medium is heated to greater temperature.

So here energy is given by the wave to the medium so here we can say that the frequency of wave must be more than this calculated frequency as we know that this some of its energy is given to medium so that its temperature is increasing

Answer 2

.
C. The frequency is equal to 1.9 Hz.