This document contains a series of multiple-choice questions focusing on core concepts of Modern Physics. The topics covered include Planck's hypothesis of energy quantization, calculations for photon energy and wavelength, and the principles of the photoelectric effect. It also explores de Broglie’s matter waves and the Heisenberg uncertainty principle, providing a comprehensive assessment of wave-particle duality and quantum theory fundamentals.
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يرجى الانتباه إلى أن المعلم قام بإعداد الأسئلة فقط، ولم يقم بإعداد الإجابات أو الشروحات المرفقة. وقد تم توليد الإجابات باستخدام تقنيات الذكاء الاصطناعي، لذلك قد تتضمن بعض الأخطاء أو عدم الدقة.
للحصول على الإجابات الصحيحة والمضمونة، يُرجى الرجوع إلى المعلم أو المصدر الدراسي المعتمد.
Question 1
DB question no.: 1
Points: 1
According to Planck's hypothesis, the energy of a vibrating atom can only exist in bundles of specific amounts. This means that energy is:
Explanation
Planck's hypothesis states that energy is not continuous but exists in discrete packets or 'quanta'.
Question 2
DB question no.: 2
Points: 1
What is a photon's energy if the photon's wavelength is 515 nm?
What potential difference (voltage) is needed to accelerate an electron so it has a 0.125-nm wavelength?
Explanation
Solving $V = \frac{h^2}{2me\lambda^2}$ for $\lambda = 0.125 \text{ nm}$ yields 96.5 V.
Question 17
DB question no.: 17
Points: 1
According to the Heisenberg uncertainty principle, what happens to the uncertainty in a particle's momentum as its position is measured more precisely?
Explanation
The principle states $\Delta x \Delta p \ge \frac{h}{4\pi}$; as $\Delta x$ (position uncertainty) decreases, $\Delta p$ (momentum uncertainty) must increase.
Question 18
DB question no.: 18
Points: 1
What primary phenomenon causes a change in a particle's momentum when high-energy, short-wavelength radiation is used to measure its location?
Explanation
The Compton effect describes the scattering of a photon by a particle, which transfers momentum and causes uncertainty in measurement.
Question 19
DB question no.: 19
Points: 1
Which of the following pairs of variables cannot be simultaneously measured with absolute precision according to Werner Heisenberg's work?
Explanation
Position and momentum are conjugate variables subject to the Heisenberg uncertainty principle.
Question 20
DB question no.: 20
Points: 1
If the momentum of an atomic particle is known with absolute precision what can be concluded about its position according to the text?
Explanation
As knowledge of momentum becomes more precise, uncertainty in position increases.
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