The frequency of the wave = 400/s
<h3>Further explanation</h3>
Given
v=200 m/s
λ=0.5 m
Required
The frequency of the wave
Solution
Frequency (f): number of waves in one second
The frequency is inversely proportional to the wavelength

Answer:
But if you place a clear container filled with hydrogen gas between the flashlight and the prism, gaps appear in the smooth rainbow of colors, places where the light literally goes missing. The dark absorption lines of a star at rest (left) get shifted towards red if the star is moving away from Earth (right)
Explanation:
Answer: 2.67 m/s^2
Explanation:
Centripetal acceleration is defined as v^2/r; in this case, it's 2^2/1.5, which is 2.67.