Quiz 7
1. How large
is the Sun's radius, compared to the Earth's?
a. Four times larger.
b. 10 times larger.
c. 100 times larger.
d. 100,000 times larger.
2. When we look
at a regular, visible-light picture of the Sun, what part of the Sun are
we
seeing?
a. The core.
b. The corona.
c. The photosphere.
d. The radiation zone.
3. What is the
source of all the energy produced in the Sun?
a. Nuclear reactions in the core that fuse hydrogen into helium.
b. Nuclear reactions in the core that convert uranium to plutonium.
c. Chemical reactions that combine oxygen and hydrogen.
d. Gases coming from the core that burn when they reach the
surface.
4. What are the
features we see as sunspots on the Sun?
a. Places that appear dark because the gas is colder than the rest of the Sun's
surface.
b. Holes in the surface of the Sun, through which we can see deep inside it.
c. Places which emit a kind of radiation that is scattered by the
Sun's
atmosphere.
d. Clouds hovering over the Sun, which prevent us from seeing the surface.
5. How do we know that the Sun rotates?