A slab of plastic rests on a slab of glass. A ray of light in the plastic crosses the interface between the plastic and the glass with the result that the ray bends toward the normal. What must be true about the indices of refraction in these materials?
a. nplastic > nglass
b. nplastic < nglass
c. nplastic = nglass
d. More information is needed to decide the answer.
b
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Which sugar is the sweetest of all sugars?
a. Sucrose b. Lactose c. Glucose d. Fructose
A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T. What is the magnitude of the magnetic torque on the loop when the plane of its area is perpendicular to the magnetic field?
A) 0.00 N ? m B) 0.41 N ? m C) 0.47 N ? m D) 0.52 N ? m E) 0.58 N ? m
Which of the following statements is correct?
a. For a nearsighted person, the near point is always located closer than 25 cm from the eye and the corrective lens is diverging. b. For a nearsighted person, the near point is always located closer than infinity from the eye and the corrective lens is converging. c. For a farsighted person, the near point is always located farther than 1 m from the eye and the corrective lens is diverging. d. For a farsighted person, the near point is always located farther than 25 cm from the eye and the corrective lens is converging.
An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A) 2.2 × 107 m/s B) 1.9 × 107 m/s C) 1.9 × 106 m/s D) 3.0 × 107 m/s E) 0.80 × 107 m/s