13 - Definitions

Question 1

Packets of energy

Answer 1

Photons

Question 2

Photon energy

E =

Answer 2

h ✖️f

Question 3

h =

Answer 3

6.63 x 10^-34

Question 4

eV =

Answer 4

1.6 x 10^-19 J

Question 5

Wave eq and photon eq

E=

Answer 5

ㅅ

Question 6

Photoelectric effect

Answer 6

High energy electromagnetic radiation causes electrons to be emitted.

Question 7

Gold leaf electroscope

Answer 7

Briefly touching the top plate with a negative electrode from a high-voltage power supply will charge the electroscope. Excess electrons are deposited into the plate and stem. The stem and plate gave the same charge so they repel each other.

Question 8

Photoelectrons are emitted only if:

Answer 8

the incident radiation is above a certain frequency

Question 9

If the incident radiation was above the threshold frequency, increasing intensity of the radiation didn’t increase the __ of the electrons but the ______ of electrons

Answer 9

KE

Amount

Question 10

Hf =

Answer 10

ø + K.E

Question 11

De Broglie Equation

ㅅ is proportional to 1/p

Answer 11

ㅅ = h/p

Question 12

Electron Diffraction

Diffracted through ____________ __________

Answer 12

polycrystalline graphite.