Question

1. as a star ages and begins to fuse helium, it expands into a

a. nebula
b. red giant
c. neutron star
d. black hole

1. which element marks the end of energy - producing fusion inside a star?

a. helium
b. carbon
c. oxygen
d. iron

1. when analyzing a star’s light, dark absorption lines can be seen in the spectrum. these lines are caused by

a. cooler gases in the star’s atmosphere absorbing specific wavelengths of light
b. radioactive decay within the star’s core
c. dust clouds between the star and earth reflecting starlight
d. lack of hydrogen in the star’s composition

1. solar flares and coronal mass ejections are both caused by

a. changes in the sun’s magnetic field
b. sudden increases in solar fusion rate
c. gravitational pull from nearby planets
d. collisions with asteroids and comets

Explanation:

• For question 7: As a star ages and starts fusing helium, it expands into a red - giant. Nebulas are star - forming regions, neutron stars and black holes are end - stage remnants after a star's death.
• For question 8: Iron marks the end of energy - producing fusion inside a star. Fusion of elements heavier than iron requires more energy than it releases.
• For question 9: Dark absorption lines in a star's spectrum are caused by cooler gases in the star's atmosphere absorbing specific wavelengths of light.
• For question 10: Solar flares and coronal mass ejections are both caused by changes in the Sun's magnetic field.

Answer:

1. B. red giant
2. D. Iron
3. A. cooler gases in the star's atmosphere absorbing specific wavelengths of light
4. A. changes in the Sun's magnetic field