The photoelectric effect can be used to measure the value of Planck’s constant. Suppose that a photoelectric effect experiment was carried out using light with ν = 7.50×1017 s-1 and ejected electrons were detected with a kinetic energy of 2.50×10-11 J. The experiment was then repeated using light with ν = 1.00×1018 s-1 and the same metal target, and electrons were ejected with a kinetic energy of 5.00×10-11 J. Use these data to find a value for Planck’s constant.

HINTS: these data are fictional and will give a result that is quite different from the real value of Planck’s constant. Be sure that you do not use the real value of Planck’s constant in any calculations here. It may help to start by thinking about how you would calculate the metal’s binding energy if you already knew Planck’s constant.

J s

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.