Quantisation of Energy Quiz

What did Planck propose about electromagnetic radiation?

• It is continuous

• It is emitted in quantised packets

• It has no energy

• It behaves as sound waves

What is a quantum?

• A wave

• A continuous signal

• A discrete bundle of energy

• An atomic nucleus

What is the quantum of electromagnetic radiation called?

• Electron

• Photon

• Neutrino

• Proton

What equation gives the energy of a photon?

• E = mc^2

• E = hf

• E = mv^2

• E = h/t

What is Planck's constant?

• 3.0 x 10^8 m/s

• 9.8 m/s^2

• 6.626 x 10^-34 Js

• 1.6 x 10^-19 C

Why did classical theory fail to explain blackbody radiation?

• It couldn't explain infrared

• It predicted infinite energy at low wavelengths

• It was too advanced

• It required new atoms

What was this classical physics problem called?

• The red shift

• The photoelectric gap

• The ultraviolet catastrophe

• Quantum dilemma

What happens to frequency as wavelength decreases?

• It decreases

• It remains constant

• It increases

• It becomes negative

What happens to the energy of a photon as its frequency increases?

• It decreases

• It increases

• It remains the same

• It doubles then halves

Why are photon energies often measured in electron volts (eV)?

• Joules are too large

• Electrons are small

• It is traditional

• Photons are electric