Practice Questions
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Who is credited with the introduction of the concept of quantization that laid the groundwork for quantum mechanics?
Max Planck, in 1900, proposed that energy is emitted or absorbed in discrete packets called quanta. Other options are incorrect because Einstein showe...
Which of the following statements best describes the relationship between wave-particle duality and quantum superposition in the context of the historical development of quantum mechanics?
Wave-particle duality shows that particles like electrons act as waves and particles at the same time. Other options are incorrect because The mistake...
Which historical experiment involving Compton scattering significantly contributed to the development of quantum mechanics by demonstrating the particle nature of light?
The Compton effect shows that X‑ray photons collide with electrons and change direction and energy, just like tiny balls. Other options are incorrect ...
How did Einstein's photoelectric effect and Schrödinger's equation collectively contribute to the development of modern technologies such as semiconductors and lasers?
Einstein showed that light can act like particles, which explains how electrons leave a surface when hit by light. Other options are incorrect because...
How did Einstein's explanation of the photoelectric effect challenge classical physics and contribute to modern technological advancements?
Einstein said light is made of packets called photons, each giving a fixed amount of energy to electrons. Other options are incorrect because Some thi...
Which of the following statements correctly describe key milestones in the development of quantum mechanics? (Select all that apply)
The photoelectric effect showed that light can behave like tiny particles called photons. Other options are incorrect because The idea that black‑body...
Which phenomenon most directly led to the development of quantum mechanics by challenging classical physics?
When light hits a metal surface, it can eject electrons, but only if the light is above a certain frequency. Other options are incorrect because Newto...
Which phenomenon played a crucial role in the early development of quantum mechanics by demonstrating the particle-like behavior of light?
The photoelectric effect shows that light can eject electrons from a metal surface. Other options are incorrect because Some think black‑body radiatio...
Imagine you're conducting an experiment to measure the energy of photons emitted from a heated metal surface. In this context, which principle explains why the energy of the emitted photons increases with temperature?
When a metal is hotter, its atoms vibrate faster. Other options are incorrect because The photoelectric effect happens when light knocks electrons out...
Order the following historical developments in quantum mechanics from earliest to latest: A. Black-body radiation, B. Photoelectric effect, C. Bohr atom model, D. Quantum mechanics formalism.
Black‑body radiation was measured first and showed that energy comes in lumps, which made scientists think of quantization. Other options are incorrec...
Which of the following phenomena is most directly associated with the development of quantum mechanics due to its challenge to classical physics?
Black-body radiation showed that energy is released in discrete packets called quanta. Other options are incorrect because Newton's laws describe how ...
The phenomenon that demonstrated the particle-like behavior of light, leading to the development of quantum mechanics, is known as the __________.
The photoelectric effect shows that light can knock electrons out of metal when its light is bright enough. Other options are incorrect because Compto...
Black-body radiation : Planck's quantization :: Photoelectric effect : ?
The photoelectric effect shows that light gives electrons only when it has enough energy. Other options are incorrect because Einstein used relativity...
What underlying principle explains why the photoelectric effect demonstrated the particle nature of light?
Light can be viewed as tiny packets of energy called photons. Other options are incorrect because This mixes up wave and particle ideas; Speed does no...
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