Which statement describes how the photoelectric effect causes an electric current to form?
O A. Light acts as particles, causing electrons on the surface it strikes
to be destroyed.
B. Light acts as a wave, causing electrons to flow in different
directions within an atom.
C. Light acts as particles, knocking electrons off the surface it
strikes.
O D. Light acts as a wave, causing electrons to flow from one atom to
another.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.