Chapter 9- Atomic And Nuclear Phenomena

Question 1

Photoelectric effect

Answer 1

When light of a sufficiently high frequency (blue to UV) hits metal the metal will emit electrons. These electrons produce a current

Question 2

Energy of emitted photon from photoelectric effect

Answer 2

E = hf

h- plancks constant (6.626 x 10^-34)

Question 3

Maximum kinetic energy of ejected electron

Answer 3

Kmax = hf-W

W- work function is the minimum energy required to eject an electron W=hf(threshold)

Question 4

Particle theory of light

Answer 4

Light is not a continuous wave, but acts as a discrete bundles of energy called photons

Question 5

What does threshold frequency depend on?

Answer 5

Type of metal

Question 6

Equation that explains mass defect

Answer 6

E = mc^2

Question 7

Fission

Answer 7

Large nuclei splitting into smaller nuclei. Rarely spontaneous.

Question 8

Alpha decay

Answer 8

Emission of alpha particle. 4-2He (2 protons and 2 neutrons leave) - they have a +2 charge

Question 9

Beta decay

Answer 9

Emission of beta particle. Electron given off only but a neutron is converted into a proton as well.

Question 10

Gamma decay

Answer 10

Emission of gamma ray (high energy photon). No change in number of protons, neutrons, or electrons.

Question 11

Electron capture

Answer 11

Reverse beta decay. Takes away one proton.

Question 12

Exponential decay

Answer 12

n = n*e^(-wvlt)

Wvl- .693/half life

Question 13

Fusion

Answer 13

Small nuclei combine to form a larger nucleus