You have to use the wave equation. The frequency times the wavelength equals the speed of the wave.

f*wavelength=speed

For light, the speed is constant. So you must calculate either the frequency or the wavelength depending on which is given. For the energy of a photon:

E=hv

h is planck’s constant and v is the frequency. The frequency can also be written as the speed divided by the wavelength, or C/wavelength. When asked to identify the color of light by the wavelength, look in your book for a table with these values. Repost if you need more help or email me.

Edit:

Don’t be nervous. Just stay calm and follow the steps. I’m sure you can use a calculator during the test so all you have to practice is using the equations. I’ll set up the first one for you.

First, read the question and ask yourself what you’re given and what you need to find out. Here, you’re given 2 parts of the wave equation.

frequency = 540,000 Hz

speed of wave = C (3*10^8m/s)

They’re asking for the wavelength in meters, so solve the wave equation for the wavelength.

wavelength= C/v

(v is the symbol for frequency)

There is no need to change any units because C is already in meters (if they were looking for centimeters you’d have to convert the speed to cm/s or the wavelength to cm after you finish the calculation)

Just plug the numbers into your calculator and voila, you have the wavelength in meters.

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