quantum

Question 1

what is the equation for energy of a photon?
QUANTUM

Answer 1

E = hf

where:
• E = energy of a photon
• h = planck’s constant
• f = frequency of photon

Question 2

what is the equation for energy of a photon using: h, c and λ?
QUANTUM

Answer 2

E = hc / λ

where:
• h = planck’s constant
• c = speed of wave (in this case light)
• λ = wavelength of wave

Question 3

what is the equation for photoelectric effect, using: h, f and φ?
QUANTUM

Answer 3

Ekmax = hf - φ

where:
• Ekmax = maximum kinetic energy of photoelectron released from the surface of the metal
• h = planck’s constant
• f = frequency of photon hitting metal
• φ = work function (the minimum energy required by the photoelectron in order to be released from the metal)

Question 4

what is the equation for the energy of the photon released from an electron when the electron drops from one energy level to another?
QUANTUM

Answer 4

hf = E1 - E2

where:
• hf = energy of the photon released
• E1 = energy of electron at energy level 1
• E2 = energy of electron at energy level 2

Question 5

what is the equation for the de Broglie wavelength, using: h and p?
QUANTUM

Answer 5

λ = h / p

where:
• h = planck’s constant
• p = momentum

Question 6

what is the equation for the de Broglie wavelength, using: h, m and v?
QUANTUM

Answer 6

λ = h / mv

where:
• h = planck’s constant
• m = mass of ‘matter’
• v = velocity of ‘matter’
• mv = momentum