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Altius FL 1 - Q47
Moiz_6047
#1 Posted : Sunday, June 20, 2021 10:32:06 PM
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Because we know that c=f x wavelength and that v = frequency x wavelength how do we know to substitute the rearranged equation in the numerator or denominator?
INSTR_Katrina_128
#2 Posted : Tuesday, June 22, 2021 7:02:46 PM
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Hi Moiz,

Equation 1 is given to us:

Δf = (v/c)*f₀

where v is the velocity of the blood particle, c is the speed of light in a vacuum, and f₀ is the original frequency of the light.

From the universal wave equation, c = fλ for light. We can technically rewrite this using the passage's variables: c = f₀*λ

Subbing in and simplifying, we get

Δf = [v/(f₀*λ)]*f₀

Δf = v/λ

Therefore, there is an inverse relationship between Δf and λ. As λ increases, Δf decreases (but not linearly).

A is the best answer.
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