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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 3 Quiz: Analog Measuring Instruments – Galvanometer, Ammeter, Voltmeter and Ohmmeter

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1.
In the photoelectric effect, doubling the intensity of incident monochromatic light with frequency \(\nu > \nu_c\) causes:
A) Doubling of the maximum kinetic energy of emitted electrons
C) Doubling of the number of emitted photoelectrons per second
B) Doubling of the stopping potential \(V_s\)
D) A 50% decrease in the threshold frequency
2.
Light of frequency \(3 \times 10^{14}\) Hz shines on a metal whose threshold frequency is \(4.5 \times 10^{14}\) Hz. If the intensity is increased 100 times, the photoelectric current will be:
B) 10 times initial current
C) Zero
D) Infinite
A) 100 times initial current
3.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Einstein's Photoelectric Equation and Work Function?
Increasing light intensity increases the maximum kinetic energy of emitted electrons
Work function E_w is universal and identical for all metals
Photoelectrons are emitted only if the incident photon frequency exceeds the threshold frequency (ν ≥ ν_c), and maximum kinetic energy is KE_max = hν - E_w, independent of light intensity
Photoelectron emission occurs at any frequency if intensity is high enough
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