A star's apparent magnitude is a measure of
a. how bright it appears to us if it is at its actual distance.
b. how bright it appears to us at a standard distance of 10 pc.
c. its energy output per second compared to the Sun.
d. its mass in solar masses.
e. its surface temperature in Kelvin.
a
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Wrought iron is
(a) Heated and then rapidly quenched into water (b) Packed in carbon to harden the iron (c) Heated in carbon monoxide (d) Deformed into shape
When water boils in Denver, Colorado (elevation 5,200 ft) is its temperature greater than, less than, or equal to the temperature of boiling water in Dallas, Texas (elevation 450 ft).
A. greater than B. less than C. equal to
We cannot predict the precise decay time of a particular radioactive 14C nucleus because
A) the calculation is too difficult for today's computers. B) a single nucleus is too small to be seen or directly detected. C) of the difficulty of determining the precise initial states of all its protons and neutron. D) of the quantum entanglement of its protons and neutrons. E) of quantum uncertainties.
An x-ray can be emitted when an electron undergoes an energy level transition
a. True b. False Indicate whether the statement is true or false