Radiation - interaction

Question 1

Photoelectric effect is how __ energy photons interact

High, low

Answer 1

Low

Question 2

An increase in wavelength and decrease in energy of photons (x-rays or gamma rays) that occurs when they are scattered by a charged particle (usually an electron)

IDENTIFY THIS EFFECT

Answer 2

Compton effect

Question 3

Compton effect is usually how __-energy photons

Low, intermediate, high

Answer 3

Intermediate

Question 4

False about Compton effect
A.Photon and electron collide as particles
B.Energy is fully transferred to the electron
C.Electron, bringing some of the photon’s energy, is ejected
D.Photon continues to a new direction with reduced energy

Answer 4

B - partial transfer of energy lang

Question 5

Radiation & matter interaction that’s Possible only for photons with high energy

Answer 5

Pair production

Question 6

What is exactly pair production? How does it work in photons?

Answer 6

Photon disappears and an electron-positron pair (which will never interact) appears in its place

Question 7

Which is true?
A.Near 1.02 MeV, the pair production effect dominates.
B.A positron is the same as a proton.
C.BOTA
D.NOTA

Answer 7

For A: Compton effect dominates @ near 1.02 MeV

For B: A positron is a positively charged particle with the same weight as the electron

Question 8

Photon gives all of its energy to an electron → electron leaves the atom/ molecule → photon disappears

What is this effect called

Answer 8

Photoelectric effect

Question 9

What happens when a neutron undergoes inelastic collision?

Answer 9

A nucleus colliding inelastically with a neutron is left at a higher energy level (excited state)

Question 10

Which is false?
A. In inelastic collision, the neutron can release this excess energy in the form of a γ-ray only
B. Most important absorption process for photons @ 100keV to 20 MeV is Compton effect
C. BOTA
D. NOTA

Answer 10

A - it can also release excess energy by emitting a β-particle. or both

Question 11

Identify the radiation interaction :)

an affected nucleus may absorb the neutron & eject energy as gamma/x-rays/beta particles

Answer 11

neutron capture

Question 12

In neutron capture, which cause ionization?

Answer 12

beta particles

Question 13

False about nuclear fission
A. Fission involves splitting heavy nucleus into 2 lighter ones
B. Fission products are stable
C. Fission products differ in mass

Answer 13

B - unstable sila

Question 14

False about nuclear fission
A. Fission reaction emits at least 2 neutrons
B. Fission reaction does not emit gamma rays
C. Fission products are usually radioactive

Answer 14

C

Question 15

important absorption process for radiation with energy less than about 100 kEv

Answer 15

photoelectric effect

Question 16

important absorption process for radiation with energy > 1.02 MeV

Answer 16

pair production

Question 17

another name for neutron capture

Answer 17

radiative capture