p. 405, # 2, 4, 5 & p. 552, #20
p. 405, # 2, 4, 5 & p. 552, #20
2. Name the regions of the electromagnetic spectrum from the
shortest wavelengths to the longest wavelengths.
2. The regions of the electromagnetic spectrum from the shortest
wavelengths to the longest wavelengths are gamma rays, X rays,
ultraviolet light, visible light (from violet to red), infrared light,
microwaves, and radiowaves.
p. 405, # 2, 4, 5 & p. 552, #20
4. Determine which band of the electromagnetic spectrum has
the following:
a. the lowest frequency
b. the shortest wavelength
4. a.
b.
c.
d.
c. the greatest energy
d. the least energy
Radio waves have the lowest frequency.
Gamma rays have the shortest wavelength.
Gamma rays have the greatest energy.
Radio waves have the least energy.
p. 405, # 2, 4, 5 & p. 552, #20
5. You and a friend are looking at the stars, and you notice two
stars close together, one bright and one fairly dim. Your friend
comments that the bright star must emit much more light than
the dimmer star. Is he necessarily right? Explain your answer.
5. My friend may be wrong because there is no way to judge. The
star that appears brighter may actually be dimmer but much closer
than the less-bright star.
p. 405, # 2, 4, 5 & p. 552, #20
20. The spectra shown below were taken for hydrogen, helium, and
lithium in a laboratory on Earth. The spectra labeled as Star 1
and Star 2 were taken from starlight. What elements are found
in Star 1 and Star 2?
20. Star one has hydrogen. Star 2 has helium.