1 Answer

Mohamed Elkamaly · Answer 1 · 2018-05-06T12:24:26+0000

We know, frequency = speed / wavelength
f = 3 * 10⁸ / 1.99 * 10⁻¹³
f = 1.50 * 10²¹ Hz

In short, Your Answer would be 1.50 * 10²¹ Hz

Hope this helps!

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