اختبار اختيار من متعدد تفاعلي: Physics MCQ – Objective Questions
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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اختبار شهادة تدريبي مؤقت للصف والمادة والفصل نفسه.
اختر إجابة واحدة لكل سؤال. عند الاختيار ستظهر النتيجة فورًا: الأخضر صحيح، والأحمر خطأ، وسيظهر تفسير الإجابة مباشرة إن كان متوفرًا. وبعد آخر سؤال ستظهر الدرجة النهائية تلقائيًا.
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
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
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
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
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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