MONDAY Is light a particle or a wave? 5/16/16 Light has properties of both a particle and a wave What is the energy of a photon whose wavelength is 450 nm? TUESDAY c = E = hf 5/17/16 fΛ 3x108 = f(450x10-9) E = (6.63x10-34)(6.67X1014) 3x108/450x10-9 = f E = 4.42x10-19 J f = 6.67x1014 WEDNESDAY 5/18/16 A metal whose work function is 4 eV is struck with light of frequency 6.2 x 1015 Hz. THURSDAY What is the max kinetic energy of photoelectrons ejected from the metal's surface? 5/19/16 KE=hf - Ф KE = (4.14x10-15)(6.2x1015) – 4 KE = 22 eV An electron that was emitted from a photoelectric experiment is measured to have a FRIDAY kinetic energy of 5.4 x 10-19 J. What is the velocity of this electron? 5/20/16 KE = ½ mv2 5.4x10-19 = ½ (9.11x10-31)v2 √(2)( 5.4x10-19)/ 9.11x10-31 = v 1.1x106 m/s = v
MONDAY 5/16/16 Is light a particle or a wave? Light has properties of both a particle and a wave TUESDAY 5/17/16 What is the energy of a photon whose wavelength is 450 nm? c = fΛ E = hf 3x108 = f(450x10-9) E = (6.63x10-34)(6.67X1014) 3x108/450x10-9 = f E = 4.42x10-19 J f = 6.67x1014 WEDNESDAY 5/18/16 THURSDAY 5/19/16 A metal whose work function is 4 eV is struck with light of frequency 6.2 x 1015 Hz. What is the max kinetic energy of photoelectrons ejected from the metal's surface? KE=hf - Ф KE = (4.14x10-15)(6.2x1015) – 4 KE = 22 eV FRIDAY 5/20/16 An electron that was emitted from a photoelectric experiment is measured to have a kinetic energy of 5.4 x 10-19 J. What is the velocity of this electron? KE = ½ mv2 5.4x10-19 = ½ (9.11x10-31)v2 √(2)( 5.4x10-19)/ 9.11x10-31 = v 1.1x106 m/s = v
final_6th_six_weeks_teacher_packet_16__1_.docx