Question

Quantum Physics - Photon Energy Electromagnetic Wave Spectrum 200 3x 3x Navegh Wand MOVES AM radie Fradio 10 10 10 Pre The Planck constant is 6.626x10^-34 J s. (a) Calculate the energy carried by a photon in an AM radio wave whose wavelength is 125.00 m. Write the result in terms of 10-28). Keep 4 decimal places. Enter a number x10-28, Submit (5 attempts remaining) (b) Calculate the energy carried by an X-ray photon whose wavelength is 25.00 nm, 1nm = 10-ºm. Write the result in terms of 10-18). Keep 4 decimal places. Enter a number x10-18 Submit (5 attempts remaining) Electromagnetic Wave - Visible Light Spectrum Visible light Orange Green Violet Infrared Red Yellow Blue Ultraviolet 800 700 600 500 400 300 ilm! Photon Energy Flashlight E = hf Er hf (c) Calculate the energy carried by a photon in a yellow light whose wavelength is 580.0 nm, 1nm = 10-ºm. Write the result in terms of 10-19 J. Keep 2 decimal places. Enter a number x10-19 Submit (5 attempts remaining) A light bulb produces 19.4 W of light power. Assume the average photon energy in the light is that of yellow photons. (d) Calculate the number of photons emitted by the light bulb every second. Write the result in terms of 1019 photons. Keep 2 decimal

Answer 1

a) 1 = 125 m E=he d. 18J he 34 - X3 X108 Eche = 1.59x1027 J=15.9x1528 J E =15.9x1028 J) or E= 15.9025x1628 J B) 1=25hm , E=hi 6.626x1034 x3x18 25X109 E = 7.95 x10183 or E=7.9512x10 c) A=58ohm, E=hc 6.626x10 580X109 E= 3.42x15ºJ d) p= 19.4W, Eang = 3.42x16'9J P=19.4313 So, in one second 19.4J energy is released through photons number of photons then. n=19.4 3.42 X1019 n=5.67X109 photons 19 = 5.67x10'