Question

question 7 (5 points)
listen
why do the terrestrial planets lack hydrogen and helium in their atmospheres?
a) hydrogen and helium cant be retained because the planet masses are too small.
b) hydrogen and helium were converted to other compounds as the planets formed.
c) hydrogen and helium were blown away by solar wind.
d) hydrogen and helium are present in rings around the terrestrial planets.
question 8 (5 points)
listen
what color would correspond with the peak wavelength of a star that has an extremely high temperature?
a) green
b) yellow
c) blue
d) red

Explanation:

• For Question 7: Terrestrial planets have relatively small masses. Their gravitational pull is not strong enough to retain light - weight gases like hydrogen and helium. Solar wind is not the main reason for the lack of these gases in their atmospheres, and they were not converted to other compounds during planet - formation in significant amounts, and there are no rings of hydrogen and helium around terrestrial planets.
• For Question 8: According to Wien's displacement law, the peak wavelength of a star's emission is inversely proportional to its temperature. A star with an extremely high temperature will have a short peak wavelength. Blue light has a shorter wavelength compared to green, yellow, and red light in the visible spectrum.

Answer:

Question 7: A. Hydrogen and helium can't be retained because the planet masses are too small.
Question 8: C. Blue