These electromagnetic waves are the most energetic:
a. x rays
b. microwaves
c. radio waves
d. gamma rays

when the frequency of an electromagnetic wave increases, its energy
a. increases.
b. decreases.
c. stays the same.
d. it depends on the exact type of electromagnetic wave.

Acup of coffee sits on the dashboard of an automobile. the car goes around a sharp curve. even though you hold the cup still, coffee still splashes out. this can best be explained due to a) density. b) friction. c) gravity. d) inertia.

Photons with the highest energy have the longest period

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?