WTMA Physics Unit 7 Review

Question 1

Which principle tells us that reference frames in gravitational fields obey the same laws as accelerating frames?

Accepted Answer

equivalence

Question 2

Which type of decay emits an electron as a neutron decays into a proton?

Accepted Answer

beta decay

Question 3

What do you observe about a ship traveling with a constant velocity of 0.4c relative to you?

Accepted Answer

its clocks appear to run slow

Question 4

What does Schrodinger's equation tell us about electrons?

Accepted Answer

they have a nonzero probability of being at many locations

Question 5

Which experiment used a screen to show that that light behaves as both waves and particles?

Accepted Answer

double-slit (Young)

Question 6

Which type of decay does NOT change the number of protons in a nucleus?

Accepted Answer

gamma decay

Question 7

Which principle tells us that frequencies in an emission spectrum are related as sums and differences?

Accepted Answer

Ritz (combination)

Question 8

Which process(es) involves the splitting of large nuclei? (fission, fusion, both, neither)

Accepted Answer

fission

Question 9

Which principle tells us that we cannot measure the position AND momentum of a particle with absolute precision?

Accepted Answer

uncertainty

Question 10

Which type of decay emits a He-4 nucleus (2 neutrons, 2 protons)?

Accepted Answer

alpha decay

Question 11

What fundamental force makes large nuclei increasingly unstable?

Accepted Answer

electromagnetic

Question 12

Which of these is NOT a postulate of SPECIAL relativity?

Accepted Answer

an accelerating reference frame is redshifted

Question 13

Which process(es) releases energy due to a decrease of total mass? (fission, fusion, both, neither)

Accepted Answer

both

Question 14

Which process(es) is primarily responsible for the energy radiated by stars? (fission, fusion, both, neither)

Accepted Answer

fusion

Question 15

Which experiment showed that positive charge is concentrated in a small but massive part of the atom?

Accepted Answer

gold-foil (Rutherford, Geiger, Marsden)

Questions 15