In fireworks displays, light of a given wavelength indicates the presence of a particular element. What are the frequency and color of the light associated with each of the following?

The four wavelengths of the problem are not given. Here they are:

a)

b)

c)

d)

The relationship between wavelength and frequency of light wave is

where

f is the frequency

is the speed of light

is the wavelength

For case a), (corresponds to red color), so its frequency is

For case b), (corresponds to blue color), so its frequency is

For case c), (corresponds to red color), so its frequency is

For case d), (corresponds to yellow color), so its frequency is

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