1. Who proposed the concept of wave-particle duality?
Answer:
Explanation:
Louis de Broglie proposed the concept that particles can exhibit wave-like characteristics and vice versa.
2. The photoelectric effect demonstrates the ______ nature of light.
Answer:
Explanation:
The photoelectric effect, where light dislodges electrons from a surface, showcases the particle nature of light, implying photons.
3. Which of the following has the shortest wavelength?
Answer:
Explanation:
Ultraviolet light has a shorter wavelength than infrared light, microwaves, and radio waves.
4. The threshold frequency is the frequency:
Answer:
Explanation:
The threshold frequency is the minimum frequency required to initiate the photoelectric effect.
5. De Broglie wavelength is associated with:
Answer:
Explanation:
De Broglie introduced the idea that all matter (particles) has a wave-like nature, thereby associating a wavelength with particles.
6. The work function of a metal is:
Answer:
Explanation:
The work function is the minimum energy necessary to dislodge an electron from the surface of a metal.
7. Electrons exhibit wave-like properties when they:
Answer:
Explanation:
When electrons pass through a slit, they exhibit interference patterns, demonstrating their wave-like properties.
8. The stopping potential in the photoelectric effect is used to determine:
Answer:
Explanation:
The stopping potential gives the negative potential that stops the most energetic photoelectrons, thereby determining their maximum kinetic energy.
9. The phenomenon where electron waves are diffracted by a crystal lattice is called:
Answer:
Explanation:
When electron waves interact with a crystal lattice and get diffracted, it's termed electron diffraction.
10. The photoelectric effect could not be explained by:
Answer:
Explanation:
The wave theory of light couldn't account for certain observations in the photoelectric effect, leading to the development of the quantum theory.
11. The Compton effect is related to the scattering of:
Answer:
Explanation:
The Compton effect describes the scattering of photons (X-rays) by electrons in a material.
12. The dual nature of electrons was confirmed by:
Answer:
Explanation:
The interference patterns observed in electron diffraction experiments confirm the wave-like nature of electrons.
13. Which effect confirmed the particle nature of light?
Answer:
Explanation:
The photoelectric effect, where light is absorbed by matter and ejects electrons, confirmed the particle nature of light.
14. For the photoelectric effect to occur, the incident light should have a frequency:
Answer:
Explanation:
For the photoelectric effect, the incident light's frequency must surpass the metal's threshold frequency.
15. Wave nature of matter is not observable for:
Answer:
Explanation:
The wave nature of matter is significant only for microscopic particles, like electrons or protons. For macroscopic objects, like baseballs, it's negligible.