7. how are the frequency and wavelength of light related?
frequency equals wavelength divided by the speed of light,
wavelength is determined by dividing frequency by the speed of light,
they are directly proportional to each other.
they are inversely proportional to each other.
equations
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They are inversely related to each other.

Explanation:

Frequency:

It is the number of waves passing in unit time through a fixed point.

It is represented by " f ".

Wavelength:

It is the distanced between two successive crust or trough of a wave.

It is represented by " λ ".

Relationship between wavelength and frequency:

Wavelength and frequency both are inversely related to each other. The wave having highest wavelength will have lowest frequency and vice versa.

The value of wavelength and frequency can be calculated through following formula.

Speed of wave = wavelength × frequency

Frequency = Speed of wave / wavelength

wavelength  = Speed of wave / frequency

i think the answer is terrae but not 100 percent sure. ▓▬▬ §