What is the frequency of an electromagnetic wave that has a wavelength of 7.6 x 10^-6 m in a vacuum? (The speed of light in a vacuum is 3.00 x 10^8
m/s.)
A. 2.3 x 10^3 Hz
B. 1.3 x 10^5 Hz
C. 4.0 x 10^13 Hz
D. 2.5 x 10^-14 Hz

D. 2.5 x 10 ^-14 Hz

Explanation:

Use wavelength formula: v = f x wavelength

Rearrange formula for frequency.

f = wavelength / v

f = 7.6 x 10 ^-6 / 3.00 x 10 ^8

f = 2.5 x 10^-14 Hz

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

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