A student investigating the photoelectric effect attempts to measure the kinetic energy of electrons emitted from the surface of a metal irradiated by laser light with photon energy hu = 1.39 eV. The work function of the metal is known to be = 0.81 eV. Predict the outcome of the experiment. Electrons are emitted with a kinetic energy of 1.39 eV. Electrons are emitted with a kinetic energy of 2.20 eV. Electrons are emitted with a kinetic energy of 0.58 eV. No electrons are emitted. Electrons are emitted with a kinetic energy of 0.81 eV.

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Chapter1: Units, Trigonometry. And Vectors
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A student investigating the photoelectric effect attempts to measure the kinetic
energy of electrons emitted from the surface of a metal irradiated by laser light with
photon energy hu = 1.39 eV. The work function of the metal is known to be =
0.81 eV. Predict the outcome of the experiment.
Electrons are emitted with a kinetic energy of 1.39 eV.
Electrons are emitted with a kinetic energy of 2.20 eV.
Electrons are emitted with a kinetic energy of 0.58 eV.
No electrons are emitted.
Electrons are emitted with a kinetic energy of 0.81 eV.
Transcribed Image Text:A student investigating the photoelectric effect attempts to measure the kinetic energy of electrons emitted from the surface of a metal irradiated by laser light with photon energy hu = 1.39 eV. The work function of the metal is known to be = 0.81 eV. Predict the outcome of the experiment. Electrons are emitted with a kinetic energy of 1.39 eV. Electrons are emitted with a kinetic energy of 2.20 eV. Electrons are emitted with a kinetic energy of 0.58 eV. No electrons are emitted. Electrons are emitted with a kinetic energy of 0.81 eV.
Among the following travelling objects, which has the shortest de Broglie
wavelength?
Hint. It is not necessary to calculate the wavelength for each object. The quickest
way to answer this question is to consider how the de Broglie wavelength depends
on the momentum (mass x speed).
A Neon atom (mass 3.4×10-26 kg) traveling at a speed of 3×10³ m/s
A person of mass 80 kg running at a speed of 3 m/s
A bird of mass 2x10-2 kg flying at a speed of 10 m/s
A Boeing 777 airplane (mass 2.5×105 kg) flying at a speed of 250 m/s (560 mph)
A car of mass 2x103 kg driving at a speed of 50 m/s
Transcribed Image Text:Among the following travelling objects, which has the shortest de Broglie wavelength? Hint. It is not necessary to calculate the wavelength for each object. The quickest way to answer this question is to consider how the de Broglie wavelength depends on the momentum (mass x speed). A Neon atom (mass 3.4×10-26 kg) traveling at a speed of 3×10³ m/s A person of mass 80 kg running at a speed of 3 m/s A bird of mass 2x10-2 kg flying at a speed of 10 m/s A Boeing 777 airplane (mass 2.5×105 kg) flying at a speed of 250 m/s (560 mph) A car of mass 2x103 kg driving at a speed of 50 m/s
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