Deck 4: The Universe and Nuclear Reactions

Question 1

A protostar is a concentrated accumulation of gas and dust in outer space that will become a star.

Answer 1

True

Question 2

The larger the apparent magnitude number, the brighter the star appears.

Answer 2

False

Question 3

The absolute magnitude represents the brightness a star would appear from a standard distance of 32.6 light-years.

Answer 3

True

Question 4

The Sun's position at noon is best marked by the

A) celestial pole.
B) celestial meridian.
C) celestial equator.
D) All of the answers are correct.

Question 5

Which of the following is evidence for the existence of "dark matter" in the universe?

A) The rate of expansion of the universe is speeding up.
B) Stars eventually use up their fuel and stop shining.
C) The outlying stars around a galaxy appear to orbit more rapidly than expected.
D) The space between stars appears dark.

Question 6

When undergoes beta-decay, the product is .

Question 7

If atom X undergoes radioactive decay and becomes atom Y with a half-life of five minutes. After 10 minutes, all number of X atoms have completely turned into to Y atoms.

Question 8

This type of radiation is released when .

A) alpha
B) beta
C) gamma
D) All of the answers are correct.

Question 9

Which of the following correctly balances this decay reaction?

A)
B)
C)
D)

Question 10

Which of the following correctly balances this nuclear fission reaction?

A)
B)
C)
D)