Which of these did Pierre and Marie Curie discover about radioactivity?
a. Uranium is the only radioactive element.
b. Several other elements are radioactive, some more so than uranium.
c. The radiation from radioactive isotopes is a specific form of X rays.
d. The radiation from radioactive isotopes includes positrons.
e. The amount of radiation depends on the salt the uranium is combined with.
b
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An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature doubles?
a. 4.0 c. 1/2 b. 2.0 d. 1/4
A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?
A) 92 km/h B) 90 km/h C) 85 km/h D) 88 km/h
On a sunny day at the beach, the reason the sand gets so hot and the water stays relatively cool is attributed to the difference in which property between water and sand?
a. mass density b. specific heat c. temperature d. thermal conductivity
The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?
A) 107° B) 90.0° C) 73.2° D) 54.7° E) 0.00°