Wilam made a chart to summarize the results of experiments with the photoelectric effect.

A 1 column table with 3 rows. The column is labeled results with entries 1) frequencies of light that were higher than the frequency threshold of the metal could not eject electrons, 2) as soon as light struck the metal electrons were ejected, 3) the kinetic energy of the ejected electrons depends only on the frequency of the light.

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.