44.When light is refracted, the quantity that does not change in either process is its
(A) direction of travel
(B) dispersion
(C) frequency
(D) speed
(E) wavelength

45.An optical fiber has a refractive index of n = 2.0, while the surrounding air has a refractive index of 1.00. If light propagates inside the fiber and is incident on the interface between the fiber and air, at what minimum angle (the critical angle) will total internal reflection occur? (A) 15° (B) 30° (C) 45° (D) 60° (E) 89°

46.To create a nonreflective coating for a camera lens, a film of index of refraction n1 = 2.0 coats the surface of the lens, which has an index of refraction n2 = 1.5. This coating leads to destructive interference for reflected monochromatic light of wavelength 600 nm in air. Assuming the light ray is incident on the film at nearly normal incidence, what could be the possible thickness of the coating film? (A) 200 nm (B) 300 nm (C) 400 nm (D) 500 nm (E) 800 nm

47.White light is spread out into spectral hues by a diffraction grating. If the grating has 1000 lines per cm, at what angle will red light (λ = 640 nm) appear in first order? (A) 14.7° (B) 7.35° (C)17.7° (D) 3.67° (E) 0.80°

48.The light intensity incident on a metallic surface produces photoelectrons with a maximum kinetic energy of 2 eV. The light intensity is doubled. Determine the maximum kinetic energy of the photoelectrons. (A) 4 eV (B) 2 eV (C) √2 eV (D) 3 eV (E) 16 eV

49.When a photon collides with a free electron at rest and the direction of motion of the photon changes, (A) the magnitude of the momentum of the photon does not change. (B) the momentum of the electron does not change. (C) the kinetic energy of the electron does not change. (D) the total energy of the photon does not change. (E) both the magnitude of the momentum and the total energy of the photon decrease.

50.A baseball (1 kg) has an energy of 100 joules. If its uncertainty in position is 1.0 m, what is the minimum percentage uncertainty in the momentum ( × 100%) of the baseball? Here, p (Δp) is the momentum (momentum uncertainty) of the baseball. (A) ＜＜ 1% (B) 1% (C) 2% (D) 5% (E) 10%

1. The dilapidated table was scratched and_______ ; a thick book had been wedged underneath its short leg.(A) cajoled (B) connived (C) despondent (D) lopsided

2. He tried not to look_______ and moved slowly along the back of the room.(A) conspicuous (B) balmy (C) nascent (D) subliminal

3. His negative attitude slowly and _______spoiled the atmosphere around the office.(A) assiduously (B) insidiously (C) strenuously (D) exponentially

4. The_______ condition of many of the city school buildings was very shocking.(A) entomological (B) epileptic (C) sordid (D) nominal

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