lucaspdc21

Approximately 5.0% of the electric energy supplied to an incandescent bulb converts into light energy. Assuming the average wavelength of the photons is 5.5x10^-7 m, how many photons are emitted each second by a 40.0 W lightbulb?

You have 1000.0 grams of room temperature water (25.0 degrees Celsius) in an insulated water bottle. You add 150.0 grams of ice at 0.00 degrees Celsius was to the bottle. 

(a) What is the equilibrium temperature of the system?

(b) How much ice is left (in grams)?