A solar cell has a short circuit current density of 30 mA cm2 and opern circuit voltage of 0.60 V under one-sun illumination at room temperature Use the ideal diode equation to calculate the open circuit voltage which is expected under illumination by 100 suns, stating any assumptions made. In practice an open-circuit voltage of 0.66 V is measured. Compare this with your result and suggest reasons for any discrepancy.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?