Modern Physics - SS1 Physics Past Questions and Answers - page 2
Which of the following statements is true regarding the energy levels of an atom according to quantum theory?
The energy levels are continuous and can take any value.
The energy levels are discrete and quantized.
The energy levels are constant and do not change.
The energy levels are determined by the temperature of the surroundings.
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According to the wave-particle duality concept in quantum theory, particles such as electrons and photons exhibit:
Only wave-like properties.
Only particle-like properties.
Both wave-like and particle-like properties.
Neither wave-like nor particle-like properties.
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The uncertainty principle in quantum theory, formulated by Werner Heisenberg, states that:
It is impossible to know both the position and velocity of a particle simultaneously with perfect accuracy.
The energy of a particle can never be determined exactly.
The wavelength and frequency of a wave are inversely proportional.
The speed of light is constant in all reference frames.
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The energy of a photon is directly proportional to its:
Wavelength.
Frequency.
Amplitude.
Speed.
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The concept of energy quantization in quantum theory implies that:
Energy can take any value within a continuous range.
Energy is limited to certain discrete values.
Energy is conserved in all physical processes.
Energy is independent of the properties of matter.
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Explain the concept of energy quantization in quantum theory. How does it differ from classical physics?
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Discuss the wave-particle duality concept in quantum theory and its implications.
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The photoelectric effect refers to the:
emission of light by a heated object
emission of electrons from a metal surface when exposed to light
scattering of light by small particles
reflection of light from a polished surface
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According to the photoelectric effect, the kinetic energy of the emitted electrons depends on the:
intensity of the incident light
wavelength of the incident light
polarisation of the incident light
frequency of the incident light
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Einstein's explanation of the photoelectric effect proposed that light consists of particles called:
electrons
photons
protons
neutrons
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