General Physics Quiz

What was the main belief of physicists at the end of the 19th century regarding the state of physics?

• Physics was only applicable to chemistry.

• Physics was irrelevant to the real world.

• Physics was in its infancy and needed major discoveries.

• Physics was fully understood and only needed refinement.

What is a black body in the context of black body radiation?

• An object that does not interact with radiation.

• An object that emits radiation based on its color.

• An object that absorbs all incident radiation.

• An object that reflects all incident radiation.

What was the 'ultraviolet catastrophe' in classical theory?

• The prediction that intensity approaches zero as wavelength approaches zero.

• The prediction that intensity decreases with increasing wavelength.

• The prediction that intensity approaches infinity as wavelength approaches zero.

• The prediction that intensity remains constant across all wavelengths.

What did Max Planck propose about the energies of harmonic oscillators?

• They are dependent on the amplitude of the wave.

• They are inversely proportional to frequency.

• They are multiples of a constant value.

• They can take any value.

What did Einstein propose about the nature of light in the photoelectric effect?

• Light is purely a wave.

• Light is purely a particle.

• Light has both wave-like and particle-like properties.

• Light is neither a wave nor a particle.

What is the work function in the context of the photoelectric effect?

• The maximum energy of an ejected electron.

• The energy of a photon at maximum wavelength.

• The energy required to stop an electron.

• The minimum energy required to eject an electron from a metal.

What did de Broglie hypothesize about matter?

• Matter does not have any wave properties.

• Matter is purely wave-like.

• Matter is purely particle-like.

• Matter has both particle-like and wave-like properties.

According to de Broglie, what determines the wavelength of matter?

• Its color and temperature.

• Its charge and frequency.

• Its mass and velocity.

• Its amplitude and intensity.

In the example problem, what is the wavelength of an electron with a given velocity and mass?

• 7.3 x 10^-12 m

• 7.3 x 10^-8 m

• 7.3 x 10^-10 m

• 7.3 x 10^-6 m

What is the significance of the de Broglie wavelength for large objects?

• It is easily measurable.

• It is irrelevant to quantum mechanics.

• It is larger than the object's size.

• It is too small to be measured.