Quantum

Question 1

what is a photon?

Answer 1

packet of energy of quantised values

Question 2

what is the equation to work out the energy of a photon?

Answer 2

energy (J) = planck constant (Js) x frequency of light (Hz)

Question 3

which wave in the electromagnetic spectrum has the highest frequency?

Answer 3

gamma

Question 4

which waves are ionising?

Answer 4

• ultraviolet
• x-ray
• gamma

Question 5

what is the equation of momentum from KE?

Answer 5

p = √2m(KE)

Question 6

what is the charge of a photon?

Answer 6

neutral

Question 7

how do we prove that electrons travel as waves?

Answer 7

diffraction and interference of electrons

Question 8

what is the photoelectric effect?

Answer 8

emission of electrons from the surface of a metal when an EM waves are incident on the metal

Question 9

what is the threshold frequency?

Answer 9

minimum frequency of wave required to emit an electron from the surface of a metal when

Question 10

what changes from a photon in different materials?

Answer 10

• wavelength
• velocity
• direction

Question 11

what remains constant of a photon in different materials?

Answer 11

• frequency
• energy