When uranium emits an alpha particle, the result is
A) thorium.
B) protactinium.
C) neptunium.
D) none of the above
Answer: A
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A. 2.42 
B. 67.5
C. 65.6
D. 24.4
E. 37.1
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
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A) 1.20 B) 1.55 C) 4.25 D) 6.50 E) 8.00
Wiley Coyote has missed the elusive roadrunner once again. This time, he leaves the edge of the cliff at 50.0 m/s horizontal velocity. If the canyon is 100 m deep, how far from the edge of the cliff does the coyote land?