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1 June, 18:25

A wavelength of light is 2,000 m. What is the frequency?

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Answers (2)
  1. 1 June, 18:32
    0
    Answer 150000Hz

    Explanation:

    Given that:

    Wavelength (λ) = 2000m

    Frequency F = ?

    Speed of light V = 3 x 10^8 m/s (Recall that the speed of light is constant, with a value of 3 x 10^8 m/s)

    So, apply V = F λ

    3 x 10^8m/s = F x 2000m

    F = (3 x 10^8m/s ➗ 2000m)

    F = 150000Hz

    Thus, the frequency of the light wave is 150000 Hz
  2. 1 June, 18:54
    0
    Frequency is 1.5 * 10^5 Hz

    Explanation:

    Wavelength of light is given to be 2000 m. It measures the distance between two successive crests or troughs of the wave. Frequency is given by the following equation

    f = c/λ, where f is the frequency, c is the speed of light = 3 * 10^8 m/s and λ is the wavelength.

    ⇒ f = 3 * 10^8/2000

    = 3/2 * 10^8 * 10^-3

    = 1.5 * 10^5 Hz
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