Which of the following provides the minimum amount of protection you need to block the following form of radiation?
alpha
A) lead suit
B) suntan lotion
C) thick leather
D) T-shirt
E) none of the above
Answer: B
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Significant Figures: What is 56 + 
written with the correct number of significant figures?
A. 62.8 B. 62.812 C. 62.81 D. 63 E. 62.8123846
A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the third mode?
A. 2,070 Hz B. 2,190 Hz C. 2,320 Hz D. 2,450 Hz E. 2,680 Hz
Spectral lines shifted toward higher frequencies are called ________.
A. red shifted B. blue shifted C. Lines cannot be shifted toward higher frequencies.
Fiber optic cable is in the form of a cylinder of fiber with index of refraction 1.67 and cladding around the outside of index of refraction 1.45. What is the maximum angle for light rays inside the fiber with respect to the cable’s axis for which the light will be fully transmitted thanks to total internal reflection?
A. 30o B. 60o C. 41o D. 49o