The Quantum Nature of Light

Which of the following statements is true about black body radiation?

• Emitted by all objects at zero temperatures.

• Spectrum is characteristic of the temperature of the body.

• Classical physics could explain this spectrum.

• Quantum physics couldn't explain this spectrum.

According to Planck's Hypothesis, energy is:

• Continuous and can take any value.

• Quantised and can only take on discrete values.

• Always equal to the frequency of light.

• Dependent on the temperature of the body.

What is the formula for energy according to Planck's Hypothesis?

• E = mc^2

• E = hf

• E = kT

• E = λT

The photoelectric effect can be explained by:

• Wave theory.

• Classical physics.

• Einstein using quantum theory.

• Newtonian mechanics.

In the photoelectric effect, what is the formula for the kinetic energy of the emitted electron?

• Ek = hf + φ

• Ek = hf - φ

• Ek = mc^2

• Ek = λT

According to Wien's Law, the peak wavelength of emitted radiation is:

• Directly proportional to the temperature.

• Inversely proportional to the temperature.

• Equal to the temperature.

• Independent of the temperature.

Which phenomenon does quantum theory provide a comprehensive explanation for?

• Gravitational waves

• Black-body radiation and the photoelectric effect

• Electromagnetic induction

• Nuclear fission

What is one of the applications of quantum theory mentioned in the text?

• Development of solar cells

• Creation of antibiotics

• Design of bridges

• Development of internal combustion engines

Which law and equation are utilized in calculating the peak wavelength and intensity of radiation from a black body?

• Newton's Law and Schrödinger's equation

• Wien's Law and Planck's equation

• Ohm's Law and Maxwell's equations

• Boyle's Law and Avogadro's equation

What does the photoelectric effect help determine?

• The speed of light

• The kinetic energy of electrons emitted from a metal surface

• The mass of an electron

• The charge of a proton