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tashanicole
27.06.2019 •
Biology
An electromagnetic wave in a vacuum has a wavelength of 0.07 m. what is its frequency? 4.3 x 108 m/s 4.3 x 10' hz 3.0 x 108 m/s 3.0 x 10' hz
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Ответ:
Answer is B (assuming it's meant to say 4.3 x 10^10 Hz)
Explanation:
Right away you can eliminate A and C because the units are wrong - m/s is units of speed, not frequency (whose units are Hz).
In general the product of an electromagnetic wave's wavelength (λ) and frequency (f) in a vacuum is equal to the speed of light (c):
λf = c
Knowing that c = 3 x 10^8 and λ = 0.07 you get:
0.07f = 3 x 10^8
f = 3 x 10^8 / 0.07
f = 4.3 x 10^10
Ответ:
Cause: Climate change, use of water irrigation
Effect: fluctuations in stream flow, river salinization
Explanation:
I hope this helps! :)