Which of the following four elements is a neutron-absorbing material used in controlling nuclear reactors?
a. Gold
b. Boron
c. Iron
d. Carbon
b
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A main sequence star has 3 times the mass of the Sun. Using ________ we find that the star is ________ times more luminous than the Sun.
A. the Stefan-Boltzmann law; 3 B. the inverse-square law; 9 C. the mass-luminosity relation; 3 D. Wien's law; 3 E. the mass-luminosity relation; 9
A 2.0-?F capacitor in series with a 2.0-k? resistor is connected to a 60-Hz ac source. Calculate the impedance of the circuit
a. 1 500 ohms b. 1 800 ohms c. 2 100 ohms d. 2 400 ohms e. 8 600 ohms
One number has three significant figures and another number has four significant figures. If these numbers are added, subtracted, multiplied, or divided, which operation can produce the greatest number of significant figures?
a. the addition b. the subtraction c. the multiplication d. the division e. All the operations result in the same number of significant figures.
In which of these cases will a ripe banana appear black?
a) When illuminated with white light b) When illuminated with blue light c) When illuminated with yellow light d) When illuminated with green light e) When illuminated with red light