What is the frequency of a photon with an energy of 3.38 x 10-19 J? A. 6.71 x 1014 Hz
B. 5.10 1014 Hz
C. 1.96 1014 Hz
D. 4.47 1014 Hz

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks