Quantum

Question 1

What is the photoelectric effect?

Answer 1

The photoelectric effect is emission of electrons from the surface of a metal when electromagnetic radiation above a certain frequency is incident on it.

Question 2

What is the equation for energy of a photon?

Answer 2

E = hf = hc/λ
h = planks constant
f = Frequency
c = Wave Speed
λ = Wave Length

Question 3

Define the threshold frequency of a metal.

Answer 3

The minimum frequency required of photons required for photoelectric emission of electrons from the metal.

Question 4

What is the memetic energy of an emitted electron’s equation?

Answer 4

E kmax = hf - WorkFunction

Question 5

What is the excitation of an electron?

Answer 5

When an electron moves up one or more energy levels in an atom.

Question 6

When an electron moves down a shell, what does it emit?

Answer 6

Energy but in the form of a photon

Question 7

What does each coloured line in an emission spectrum correspond with?

Answer 7

It corresponds with the wavelength and frequency of the light source.

Question 8

Define the electron volt?

Answer 8

Energy gained by an electron accelerated through a potential difference of 1V.
1 eV = 1.6 x10 -19 J

Question 9

What is the phenomena that can only be explained by the wave model of light?

Answer 9

Diffraction and I terference

Question 10

What is the equation for the de Brogile wave length of a particle?

Answer 10

Lander = h/f = h /mc