The white light emitted by a fluorescent lamp is provided by the
A) mercury vapor in the lamp.
B) phosphors on the inner surface of the lamp.
C) high temperature of the glowing gas.
D) filtering effect of the glass tubing.
Answer: B
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Atoms that have the same number of protons but a different number of neutrons are called ____
a. ions b. elements c. isotopes d. molecules e. nucleons
Two students stand poised to leap off a high dive structure into the swimming pool below. Student B is twice as massive as student A. Which of the following is true?
a. Student B will reach the ground sooner than student A b. Both students have the same gravitational potential energy c. Both students will have the same kinetic energy just before impact d. Student B did twice as much work climbing to the top of the structure
One watt is equal to one joule per ______________
a. second b. newton c. hour d. kilogram
A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object?
A) It loses 0.23 J. B) It gains 0.69 J. C) It loses 0.47 J. D) It loses 1.4 J. E) The energy of the object is unchanged.