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Astr 1050     Homework 4
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Question 3:   What is the correct order that shows increasing photon energy for wavebands of the electro-magnetic spectrum?
a.Radio -- Infrared -- Optical -- Ultraviolet -- X-ray -- Gamma Ray
b.X-ray -- Gamma Ray -- Radio -- Infrared -- Optical – Ultraviolet
c.Infrared -- Radio -- Optical -- Ultraviolet -- Gamma ray -- X-ray
d.Radio -- Optical -- Infrared -- Ultraviolet -- X-ray -- Gamma Rays
e.Infrared -- Radio -- Ultraviolet -- X-ray -- Optical -- Gamma Rays
Question 4:   Compared to gamma rays, radio waves travel
a. slower (i.e., at the speed of sound).
b. At the same speed.
c. Faster
Question 5:   The thickness of a plastic freezer storage bag is roughly 0.1 mm. How many wavelengths of red light is this?
0.1mm/7000Angstroms = 140.