Science Bowl Practice Questions

Physics - 16

ANSWER: X -- ELECTRICAL RESISTANCE

97.

Multiple Choice: An x-ray photon collides with a free electron, and the photon is scattered. During this
collision there is conservation of:

w) momentum but not energy
x) neither momentum nor energy
y) energy but not momentum
z) both momentum and energy

ANSWER: Z -- BOTH MOMENTUM AND ENERGY

98.

Multiple Choice: In the sun, helium is produced from hydrogen by:

w) radioactive decay
x) disintegration
y) fission
z) fusion

ANSWER: Z – FUSION

99.

Multiple Choice: The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of
this isotope remaining after 20 days is:

w) 0.312 grams
x) 0.625 grams
y) 1.25 grams
z) 2.50 grams

ANSWER: X -- 0.625 GRAMS

100.

Multiple Choice: The idea that electrons revolved in orbits around the nucleus of an atom without

radiating energy away from the atom was postulated by:

w) Thompson
x) Bohr
y) Rutherford
z) Einstein

ANSWER: X -- BOHR