Part A Rank these electromagnetic waves on the basis of their speed (in vacuum).

Question

Part A

Rank these electromagnetic waves on the basis of their speed (in vacuum).

Rank from fastest to slowest. To rank items as equivalent, overlap them.

Words to choose from: green light, AM radio wave, X ray, yellow light, infrared light, FM radio wave

Part B

Rank these electromagnetic waves on the basis of their wavelength.

Rank from longest to shortest. To rank items as equivalent, overlap them.

Words to choose from: green light, infrared light, yellow light, AM radio wave, X ray, FM radio wave

Part C

Rank these electromagnetic waves on the basis of their frequency.

Rank from largest to smallest. To rank items as equivalent, overlap them.

Words to choose from: AM radio wave, FM radio wave, infrared light, yellow light, X ray, green light

Explanation / Answer

a) All electromagnetic waves have the same, invariant speed (c) in vacuum.

b) AM radio wave, FM radio wave, infrared light, yellow light, green light, X ray.

c) Since frequency is inversely proportional to wavelength, the frequency order is exactly the opposite of the wavelength order:
X ray, green light, yellow light, infrared light, FM radio wave, AM radio wave.

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