High energy waves have Gamma rays
So the first thing you need to do is convert the wavelength from centimeters to meters. This is quite easy, all you do is divide by 100.
Then I'm assuming the equation they're talking about is c = f λ.
c = the speed of the wave
f = the frequency of the wave
<span>λ = the wavelength
</span>
So all you need to do is multiply the frequency they gave you by the wavelength you calculated.
TOP ROW
f = 10 hz
<span>λ = .1 m
</span>c = 10×.1
c = 1 m/s
2ND ROW
<span>f = 2.5 hz
</span><span>λ = 10</span>÷100
λ = .1 m
c = 2.5×.1
c = .25 m/s
3RD ROW
f = 30 hz
λ = 2÷100
<span>λ = .02
</span>c = 30×.02
c = .6 m/s
BOTTOM ROW
f = 50 hz
<span>λ = 1</span>÷100<span>
</span><span>λ = .01
</span>c = 50×.01
c = .5 m/s
C. a longer wavelength
Red has the longest wavelength and the wavelength decreases down the visible light spectrum to Violet which has the shortest wavelength
B. The kinetic energy will decrease.