What is the energy of a photon whose frequency is 2.9 1020 Hz? (h = 6.63 1034 Js and 1 eV = 1.60 1019 J)
a. 0.2 MeV
b. 1.2 MeV
c. 1.9 MeV
d. 3.1 MeV
e. 0.8 MeV
[Ques. 2] A light beam is shining on a metal target that has a work function of 1.8 eV. If a stopping potential of 0.7 V is required, what is the wavelength of the incoming monochromatic light? (h = 6.63 1034 Js, c = 3.00 108 m/s, 1 eV = 1.60 1019 J, and 1 nm = 109 m)
a. 497 nm
b. 166 nm
c. 796 nm
d. 1130 nm
e. 691 nm
[Ques. 3] What is the wavelength of a monochromatic light beam, where the photon energy is 2.15 eV? (h = 6.63 1034 Js, c = 3.00 108 m/s, 1 nm = 109 m, and 1 eV = 1.6 1019 J)
a. 308 nm
b. 578 nm
c. 223 nm
d. 156 nm
e. 475 nm
[Ques. 4] What is the wavelength of a monochromatic light beam, where the photon energy is 4.14 1019 J? (h = 6.63 1034 Js, c = 3.00 108 m/s, and 1 nm = 109 m)
a. 160 nm
b. 480 nm
c. 72 nm
d. 187 nm
e. 915 nm
[Ques. 5] What is the frequency of monochromatic light where the photon energy is 4.3 1019 J? (h = 6.63 1034 Js)
a. 4.3E+15 Hz
b. 2.1E+15 Hz
c. 6.5E+14 Hz
d. 1.9E+14 Hz
e. 6.5E+13 Hz
[Ques. 6] Light of wavelength 6.9 107 m has an energy of: (h = 6.63 1034 Js, c = 3.00 108 m/s)
a. 2.9E19 J
b. 9.6E20 J
c. 3.1E19 J
d. 4.3E20 J
e. 3.2E20 J
[Ques. 7] Of the following photons, which has the lowest energy?
a. visible b. ultraviolet
c. infrared d. microwave
[Ques. 8] Of photons of red, yellow, green, and blue light, which photons have the least energy?
a. red b. blue
c. green d. yellow
[Ques. 9] Of photons of red, yellow, light, and blue light, which photons have the greatest energy?
a. red
b. yellow
c. green
d. blue
[Ques. 10] Sources of red, blue, and yellow light each emit light with a power of 50 mW. Which source emits more photons per second?
a. the red source
b. the blue source
c. the yellow source
d. They all emit the same number per second.
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