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In the photoelectric effect, the maximum kinetic energy of emitted electrons depends on the:

• 1 Frequency of light
• 2 Area of metal
• 3 Time of exposure
• 4 Intensity of light

The energy of a photon is given by:

• 1 h f
• 2 h f²
• 3 h / f
• 4 f / h

de Broglie wavelength is:

• 1 p / h
• 2 h / p
• 3 h / E
• 4 h p

Compton scattering shows that light behaves as:

• 1 Particles
• 2 Only waves
• 3 Neutral rays
• 4 Sound

Einstein's famous mass energy relation is:

• 1 E = m c
• 2 E = m c²
• 3 E = m² c
• 4 E = c / m

The minimum frequency of light needed to emit photoelectrons is the:

• 1 Beat frequency
• 2 Threshold frequency
• 3 Resonant frequency
• 4 Critical frequency

Heisenberg's uncertainty principle says we cannot know exactly both the position and the:

• 1 Charge
• 2 Momentum
• 3 Colour
• 4 Mass

Pair production needs a photon of energy at least:

• 1 13.6 eV
• 2 1.02 MeV
• 3 931 MeV
• 4 0.51 MeV