Starting from rest, an electron accelerates through a potential difference of 67 V. What is its de Broglie wavelength? (h = 6.63 10-34 Js, me = 9.11 10-31 kg, and 1 eV = 1.60 10-19 J)
a. 1.1 10-10 m
c. 1.9 10-10 m
b. 1.5 10-10 m
d. 2.3 10-10 m
[Ques. 2] The de Broglie wavelength of a 0.060-kg golf ball is 3.56 10-34 m. What is its speed? (h = 6.63 10-34 Js)
a. 31 m/s
c. 26 m/s
b. 15 m/s
d. 48 m/s
[Ques. 3] What is the de Broglie wavelength for a proton (m = 1.67 10-27 kg) moving at a speed of 3.0 106 m/s? (h = 6.63 10-34 Js)
a. 0.33 10-13 m
c. 0.66 10-13 m
b. 1.3 10-13 m
d. 2.0 10-13 m
[Ques. 4] According to de Broglie, as the momentum of a moving particle is quartered, the corresponding wavelength changes by what factor?
a. 1/4
c. 16
b. 1/16
d. 4
[Ques. 5] According to the de Broglie hypothesis, which of the following statements is applicable to the wavelength of a moving particle?
a. directly proportional to its momentum
b. inversely proportional to its energy
c. inversely proportional to its momentum
d. directly proportional to its energy
[Ques. 6] A proton and an electron each have the same de Broglie wavelength. (i) Which has the lower speed, and (ii) which has the lower kinetic energy?
a. (i) the electron, (ii) the electron
b. (i) the electron, (ii) Either one can have the greater kinetic energy.
c. (i) the proton, (ii) Either one can have the greater kinetic energy.
d. (i) the proton, (ii) the proton
[Ques. 7] If a 1H nucleus, a 2H nucleus, and a 3H nucleus all had the same momentum, which one has the lowest de Broglie wavelength?
a. 3H
b. 2H
c. 1H
d. All three have the same de Broglie wavelength.
[Ques. 8] Sources of red, blue, and yellow light each emit light with a power of 50 mW. Which source emits the least photons per second?
a. the red source
b. They all emit the same number per second. c. the blue source
d. the yellow source
[Ques. 9] Who was the first to successfully explain the photoelectric effect?
a. Young
c. Planck
b. Einstein
d. Bohr
[Ques. 10] Of the following energies for photons, which is the least energy that could result in photoelectron production if the work function is 1.60 eV?
a. 1.50 eV
c. 2.90 eV
b. 6.01 eV
d. 3.50 eV
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