Circular Apertures: Light of wavelength 500 nm illuminates a round 0.50-mm-diameter hole. A screen is placed 6.0 m past the slit. What is the width of the central bright circle on the screen?
A. 15 mm
B. 260 ?m
C. 7.3 mm
D. 3700 ?m
Answer: A
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A) 1530 m. B) 2295 m. C) 3060 m. D) 4590 m.
Light of wavelength 521 nm is incident on a target metal that has a work function of 1.6 eV. What stopping potential is required for this combination in a phototube? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 4.0 V b. 0.8 V c. 2.0 V d. 0.4 V e. 2.4 V
A series RLC ac circuit has a capacitive reactance of 55 
and inductive reactance of 25
and a resistance of 40 
What is the phase constant of this circuit?
A. 37
B. -37
C. 53
D. -53
E. 66