Question

Which of the following statements about the electromagnetic spectrum are true?

Choose all that are correct

1. X-rays are higher frequency than IR radiation

2. Blue light has a shorter wavelength than red light

3. UV photons have higher energy than IR photons

4. Almost all of the electromagnetic spectrum is visible to the human eye

5. Radio waves have frequencies smaller than microwaves

Answer 1

recall that

E = hv

v = c/Wl

E = hc/WL

so..

1. X-rays are higher frequency than IR radiation --> X-rays have higher energy, so they must have higher frequency, this is true

2. Blue light has a shorter wavelength than red light --> True, since Blue light has higher energy, then this must be true

3. UV photons have higher energy than IR photons--> TRUe, since UV light has higher energy

4. Almost all of the electromagnetic spectrum is visible to the human eye --> False, actually just a very small fraction

5. Radio waves have frequencies smaller than microwaves --> radio waves hav ethe longest wavelengths, therefore they have low frequencies... that is, true