Thin Lenses: Starting from very far away, an object is moved closer and closer to a converging lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)
A. The image gets closer and closer to the lens.
B. The image gets farther and farther from the lens.
C. The image eventually changes from virtual to real.
D. The image eventually changes from real to virtual.
E. The image keeps getting larger and larger.
Answer: D
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Polarization: Unpolarized light passes through a combination of two ideal polarizers. The transmission axes of the first polarizer and the second polarizer are at 30.0° to each other. What percentage of the original light gets through the combination?
A. 37.5% B. 50% C. 75% D. 100%
An object that completes 20 vibrations in 10 seconds has a frequency of
A) 0.5 hertz. B) 1 hertz. C) 2 hertz. D) 200 hertz.
Suppose the first excited vibrational state of a molecule is at 1.50 eV. If the potential is close to that of a simple harmonic oscillator, the energy of the ground state is
A) 0 eV B) 0.25 eV C) 0.30 eV D) 0.50 eV E) 0.75 eV
In the figure, the current in a solenoid having no appreciable resistance is flowing from b to a and is decreasing at a rate of 9.6 A/s. The self-induced emf in the solenoid is found to be 8.4 V
(a) What is the self-inductance of the solenoid? (b) Which point, a or b is at higher potential? What will be an ideal response?