I think the answer is Allele am not so sure of it and sorry if my answer is wrong or didn’t help okay
Answer:
C
Explanation:
It is the answer I think let me know
The area of the bar over r=4 is 0.468
1. Frequency: 
The frequency of a light wave is given by:

where
is the speed of light
is the wavelength of the wave
In this problem, we have light with wavelength

Substituting into the equation, we find the frequency:

2. Period: 
The period of a wave is equal to the reciprocal of the frequency:

The frequency of this light wave is
(found in the previous exercise), so the period is:

negative acceleration- deceleration