When using 545-nm light, how far is the adjustable mirror of a Michelson interferometer moved when 200 fringe shifts are counted?
a. 1.36 × 10^–6 m
b. 2.73 × 10^–5 m
c. 5.45 × 10^–5 m
d. 1.36 × 10^–4 m
e. 2.7 × 10^–4 m
b
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An iron bolt is galvanized with a coating of zinc 0.03 cm (0.012 in) thick to protect the iron in a saltwater environment. The bolt has an area of 2 cm2 and is used to secure an iron plate with an area of 100 cm2 that is exposed to saltwater. In an experiment in seawater with a zinc coated iron anode of 2 cm2 and an iron plate cathode with an area of 100 cm2 a corrosion current of 2 mA is measured. Predict the expected lifetime in years or days of the zinc coating in this application assuming that the zinc coating is uniformly corroded and that the current efficiency is 100 %.
What will be an ideal response?
A piece of plastic has a net charge of +2.00 ?C. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C)
A) 1.25 × 1013 B) 1.25 × 1019 C) 2.50 × 1013 D) 2.50 × 1019
Parallel Wires: Two long parallel wires are placed side-by-side on a horizontal table and carry current in the same direction. The current in one wire is 20 A, and the current in the other wire is 5 A. If the magnetic force on the 20-A wire has magnitude F, what is the magnitude of the magnetic force on the 5-A wire? No external magnetic fields are present.
A. 4F B. 2F C. F D. F/2 E. F/4
Distinguish between a solar eclipse and a lunar eclipse, and the reasons for each
What will be an ideal response?