The speed of an electromagnetic wave is a constant, 3.0 × 108 m/s. the wavelength of a wave is 0.3 meters. what is the frequency? a. 9.0 × 108 hz b. 1.0 × 109 hz c. 1.0 × 108 hz d. 9.0 × 107 hz

option B. 1.0 × 10⁹ Hz

Explanation:

The speed, s, of a wave, equals the product of its frequency, ν, times its wavelength, λ:

As the question states, the speed of an electromagnetic wave is a constant, c, equal to 3.0 × 10⁸ m/s.

Substituting this constant in the equation for the speed of the wave, you get:

From that equation, you can solve for the frequency to show the inverse realation of frequency and wavelength:

Now, you just have to substitute values and compute:

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

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