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zepelin [54]
2 years ago
10

If an EM wave has a wavelength of 400nm,what is its frequency? What kind of wave is it?

Physics
2 answers:
Oksanka [162]2 years ago
5 0

Answer:

Electromagnetic waves are categorized according to their frequency f or, equivalently, according to their wavelength λ = c/f. Visible light has a wavelength range from ~400 nm to ~700 nm. Violet light has a wavelength of ~400 nm, and a frequency of ~7.5*1014 Hz.

Explanation:

Feliz [49]2 years ago
3 0

electromagnetic wave 7.5 * 10 14 HZ

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pogonyaev
Ok so we know:
The time (t) is 18seconds
The acceleration (a) is 2.2m/s2
The displacement (r) is 660

Using the equation
r = ut +  \frac{1}{2} a {t}^{2}
With 'u' being the initial velocity we want, we get:
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3 years ago
The graph shows projected changes in the populations of the world.
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Answer: C. Africa

Explanation:

The data given on the graph shows that:

Asia will grow from around 1,300 million to 5,000 million in 2050 which is an increase of:

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Europe will decrease over that period.

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From the options give, Africa will see the greatest increase at 6.67 times its population in 1950.

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