# How do you calculate light frequency?

Speed of light (c) over wavelength ( λ).

Because light travels at the speed of light—after all, it's not called the speed of light for nothing—the only factor that could affect frequency, or the number of waves per second, would be wavelength. This phenomenon, by the way, only happens in vacuums; in non-vacuums, the speed of light does not equal c, so numbers may differ slightly, but frequency still equals the speed of light over wavelength.

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The frequency of light can be calculated using the equation:

[ \text{Frequency} = \frac{\text{Speed of light}}{\text{Wavelength}} ]

Where:

- Frequency is measured in Hertz (Hz)
- Speed of light is approximately (3 \times 10^8 , \text{m/s}) in a vacuum
- Wavelength is the distance between two consecutive peaks or troughs of a wave, measured in meters (m).

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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