Using the experimental apparatus shown in right figure, when a UV light with wavelength 1 = 240nm shines on a particular metal plate, electrons are emitted from plate 1, crossing the gap to plate 2 and causing a current to flow through the wire connecting two plates. The battery voltage is gradually increased until the current in the ammeter drops to zero, at which point the battery voltage is 1.40 V. Ask: a) What is the energy of the photons in the beam of light in eV? b) What is the maximum kinetic energy of the emitted electrons in eV? plate 2 LAV A Tammeter incident light plate 1 Pelectrons

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1.
Using the experimental apparatus shown in right figure,
when a UV light with wavelength A = 240nm shines on
a particular metal plate, electrons are emitted from plate
1, crossing the gap to plate 2 and causing a current to
flow through the wire connecting two plates. The
battery voltage is gradually increased until the current in
the ammeter drops to zero, at which point the battery
voltage is 1.40 V. Ask:
a) What is the energy of the photons in the beam of
light in eV?
b) What is the maximum kinetic energy of the emitted electrons in eV?
c) What is work function of the metal in eV?
d) What is the longest wavelength that would cause electrons to be emitted for this metal?
plate 2
AV
incident
light
Pelectrons Tammeter
plate 1
Transcribed Image Text:1. Using the experimental apparatus shown in right figure, when a UV light with wavelength A = 240nm shines on a particular metal plate, electrons are emitted from plate 1, crossing the gap to plate 2 and causing a current to flow through the wire connecting two plates. The battery voltage is gradually increased until the current in the ammeter drops to zero, at which point the battery voltage is 1.40 V. Ask: a) What is the energy of the photons in the beam of light in eV? b) What is the maximum kinetic energy of the emitted electrons in eV? c) What is work function of the metal in eV? d) What is the longest wavelength that would cause electrons to be emitted for this metal? plate 2 AV incident light Pelectrons Tammeter plate 1
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