c = 3 * 10 ^ 8 m / s (meters per second) – the speed of propagation of electromagnetic waves;
l = 2 centimeters – the length of electromagnetic waves.
It is required to determine v (Hertz) – the frequency of electromagnetic waves.
We translate the units of measurement of length into the SI system:
l = 2 cm = 2 * 10-2 = 2/100 = 0.02 meters.
Let’s find the period of wave oscillations:
T = l / c.
Then the frequency of electromagnetic waves will be equal to:
v = 1 / T;
v = 1 / (l / c) = c / l;
v = 3 * 10 ^ 8 / 0.02 = 150 * 10 ^ 8 = 1.5 * 10 ^ 10 Hertz.
Answer: the frequency of electromagnetic waves will be equal to 1.5 * 10 ^ 10 Hertz.
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