Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen (A) increases, (B) decreases, or (C) remains the same if, The spacing between the slits increases.
A. increases
B. decreases
C. remains the same
B. decreases
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Which of these statements about electron energy levels in hydrogen atoms is true?
A. An electron with a positive total energy is a bound electron. B. The orbital angular momentum of an electron in the ground state is zero. C. An electron in the hydrogen atom is best represented as a traveling wave. D. An electron in state n can make transitions only to the state n + 1 or n - 1.
A wheel is spinning on an axle. The linear velocity of a point on the rim is simply the product of the radius times the rotational velocity, as long as the rotational velocity is measured in units of
A. deg/min. B. rad/s. C. deg/s. D. rev/s. E. rev/min.
If the intensity of a sound is increased by a factor of 100, how is the decibel level changed? The new decibel level will be:
a. two units greater. b. double the old one. c. ten times greater. d. twenty units greater.
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.