Chapter 9- Atomic And Nuclear Phenomena Flashcards Preview

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Flashcards in Chapter 9- Atomic And Nuclear Phenomena Deck (13)
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1

Photoelectric effect

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

2

Energy of emitted photon from photoelectric effect

E = hf

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

3

Maximum kinetic energy of ejected electron

Kmax = hf-W

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

4

Particle theory of light

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

5

What does threshold frequency depend on?

Type of metal

6

Equation that explains mass defect

E = mc^2

7

Fission

Large nuclei splitting into smaller nuclei. Rarely spontaneous.

8

Alpha decay

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

9

Beta decay

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

10

Gamma decay

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

11

Electron capture

Reverse beta decay. Takes away one proton.

12

Exponential decay

n = n*e^(-wvlt)

Wvl- .693/half life

13

Fusion

Small nuclei combine to form a larger nucleus