Question

Problem 4 (10 pts) A blue LED laser is pointed at a glass of water whose volume is 355 mL. The specific heat of water is 1.000 cal/g °C and the density of water is 1.008 g/mL. (a) One photon emitted by the LED has a wavelength of 395 nm. Determine the energy of this photon. (3pts) (b) If all the energy from the LED is absorbed by the water, how many mols of photos will it take to raise the temperature of the water by 5.0 °C? (6pts)

Answer 1

September WEDNESDAY Week 40 Day 274-092) 2020 30 September 08.00 Solunon oco ab Energy-o-photon = planches constantx_speedoglu leavelength cm 08.00 (15 09.00 0.00 = 6.626x10-34 J-8 x 3x108 mts 395× 10-9 DA = 5x10-19 Joule LJ) 8_ cler se 6b Amount of energy absorbed - MCOT - density = mass volume - a mass (9) 3.0089, x 335 DE - : 337-84 g Now, -mounlo, energy absorbed EMCAT - = 337.848x4:27.X57 __01 = 7 X103 Joule sor no. of holes a photon = Amount of energy assusted Energy of pharma = 7x1037 5x105195 Sy4X7622hole Seanned with Eartscanner