The pupil of the eye increases in size under which condition?
a. object viewed is well illuminated
b. eye is focused on a nearby object
c. object viewed is dimly illuminated
d. eye is focused on a distant object
C
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Work-Energy Theorem: A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is applied to a cart on a level frictionless floor. The cart starts from rest and moves 2.0 m horizontally along the floor due to this force. What is the cart's final kinetic energy?
A. 200 J B. 160 J C. 120 J D. zero
Redshift measurements of the visible afterglow of a gamma-ray burst show that these objects are:
A) in the solar neighborhood. B) in the Milky Way Galaxy. C) in the Local Group. D) billions of light-years away. E) at the most extreme observable distances.
The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer
The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity is zero at the observer. What are the two possible axis angle settings (less than 180°) of polarizer B? A) 40° and 90° B) 40° and 130° C) 40° and 140° D) 90° and 130° E) 90° and 140°
Light incident on a thin film is reflected and transmitted at each surface. Why does a thin film have to be "thin" for an interference pattern to form?
a. Light would not penetrate a thick film. b. The surfaces of the film must be as close to perfectly parallel as possible. Irregularities would be magnified in a thick film. c. The thickness of the film must be less than the wavelength of light. d. Light is not slowed down when it enters into a thin film. e. Light speeds up as it enters a thin film.