Answer the following statement(s) true (T) or false (F)
1. The energy carried by an electromagnetic wave is non-negative everywhere at all times.
1. TRUE
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Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
A. 95% B. 60% C. 80% D. 64% E. 75%
Rover eats 0.50 pound of dry dog food per day. How many 5.0-kilogram sacks of dog food does his owner need to buy in a year?
A) 17 B) 25 C) 52 D) 80 E) 81
Nordheim’s rule states that the electrical resistivity of a metal alloy increases _________with increases in the atomic fraction of impurity atoms for a dilute solution.
Fill in the blank(s) with the appropriate word(s).
Astronomers generally can measure a star's mass if only it is a member of a binary star system. What characteristics of the stars must we know to measure the masses of the stars in a binary system?
A) their spectral types and their distance from Earth B) their absolute magnitudes and their luminosities C) their orbital period and average orbital distance D) their luminosities and distance from Earth