A round 0.85-mm-diameter hole is illuminated by infrared light of wavelength 2.5 ?m What is the angle of the first dark fringe in the resulting pattern?
A) 4.8 × 10-2 degrees B) 3.6 × 10-3 degrees C) 0.21 degrees D) 1.2 × 10-2 degrees
C
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What will be an ideal response?
In beta minus decay, the number of neutrons in the nucleus
A) is decreased by 1. B) is decreased by 2. C) is increased by 1. D) is increased by 2. E) remains unchanged.
The vast numbers of electrons in a coin don't fly off the surface because
A) mutual repulsion is incomplete. B) they are attracted by an equal number of protons. C) they are strongly bonded to their atoms. D) all of the above E) none of the above
The size of the electric current in a electrical conductor is a function of which of the following?
a. conductor cross sectional area c. density of charge carriers b. velocity of charge carriers d. All of these choices are valid.