Which statement best descibes what happens when a person sees a orange t-shirt?

a. orange light absorbed by the t-shirt is perceived by the human eye.
b. orange light reflected from the t-shirt enters human eyes.
c. the t-shirt absorbs orange light by the human eyes.
d. human eyes reflect the orange light back to the t-shirt.

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3