Question

Questions [1] One difference between mechanical waves and EM waves is: only one needs a source, only one needs a medium to disturb. (2) If a color of visible light had a frequency of 621 THz, then the color is: red, orange, yellow, green, blue, violet. [3] Different types of EM waves are categorized by their: amplitude, energy, frequency, wave speed in a vacuum. [4] The prefix infra- means: lower than , higher than, about the same. [5] Any piece of matter will emit what type of radiation due to the fact that is has a temperature: visible light, ultraviolet, X-ray, infrared. [6] Compared to x-rays, radio waves have: a longer wavelength, a shorter wavelength, the same wavelength. [7] The sun emits which type of radiation the most: gamma ray, ultraviolet, visible light, near infrared, far infrared. [8] Sun tans result from exposure to: near-infrared, visible light, ultraviolet, microwaves. [9] The x in x-ray stood for: extra high, exact frequency, unknown, that after white light. [10] The source of a gamma ray is: nuclei, electrons, electric and magnetic fields, electric currents, thermal radiation.

Answer 1

1. EM Waves do not need a medium for propagation.

2. Wavelength = speed of light / frequency = 483 nm

Means Orange

3. Frequency

4. Lower than

5.Infrared

6.longer wavelength

7.ultraviolet

8. Ultraviolet

9. Unknown

10. Nuclei