An excited atom can lose energy by emitting an electron
a. True
b. False
Indicate whether the statement is true or false
False
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Applications to Astronomy: The appearance of the great range of brightness among stars is due to
A. only to the differences in the amount of light different stars emit. B. only to the differences in the distances of stars from us. C. both of these differences indicated. D. None of these answers.
A light flash leaves a master clock at x = 0 at time t = -12 s, is reflected from an object a certain distance in the -x direction from the origin, and then returns to the origin at t = +8 s. From this information, we can infer that the spacetime coordinates of the reflection event are [t, x] =
A. [4 s, 20 s] B. [-4 s, -20 s] C. [10 s, -2 s] D. [2 s, -10 s] E. [-2 s, -10 s] F. Other (specify)
A race car traveling at 100 m/s enters an unbanked turn of 400 m radius. The coefficient of (static) friction between the tires and the track is 1.1 . The track has both an inner and an outer wall. Which statement is correct?
a. The race car will crash into the outer wall. b. The race car will crash into the inner wall. c. The car will stay in the center of the track. d. The car will stay in the center of the track if the driver speeds up. e. The car would stay in the center of the track if the radius were reduced to 200 m.
The image of a plant is 4.0 cm from a concave spherical mirror having a radius of curvature of 10 cm. Where is the plant relative to the mirror?
A) 4.4 cm in front of the mirror B) 9.0 cm in front of the mirror C) 1.0 cm in front of the mirror D) 2.2 cm in front of the mirror E) 20 cm in front of the mirror