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Worksheets9th grade photoelectric effect
Total questions: 12
Worksheet time: 3600secs
Name
Class
Date
1.
Photons of energy 2.1 eV cause a photoelectric currenton the surface of caesium, which has a workfunction of 1.9 eV. How many times should the energyof the photon be increased in order to double themaximum kinetic energy of the photoelectrons?
a)
2.18
b)
1.09
c)
3.28
d)
4.36
2.
What must the minimum energy of photons falling ona copper plate be in order to observe the photoelectriceffect? (work function for copper 4.7 eV)
a)
2.35 eV
b)
1.175 eV
c)
4.7 eV
d)
9.4 eV
3.
What is the maximum kinetic energy of electrons emitted from cesium (Cs), when light of frequency1015 Hz falls upon the metal? (work function for Cs is 1.8 eV)
a)
7.728x10-19 J
b)
4.83 eV
c)
1.864x10-19 J
d)
2.34 eV
4.
Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?
a)
only high frequency
b)
only low frequency
c)
both of them
d)
doesn't depend to frequency
5.
Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?
a)
only high frequency
b)
only low frequency
c)
both of them
d)
doesn't depend to frequency
6.
Do the photons of violet light or the photons of red light, falling on a metal surface with the same intensity,cause emission of more electrons?
a)
red light
b)
violet light
c)
same
7.
The photoelectric effect is observed on barium oxide(BaO) at a minimum frequency of 0.24x1015 Hz . Find the work function of bariumoxide in eV.
a)
1 eV
b)
2 eV
c)
1.6 eV
d)
2.7 eV
8.
The cut-off wavelength for the photoelectric effect of platinum is 220 nm. Find the work function of platinum in eV
a)
11.25 eV
b)
9 eV
c)
4.5 eV
d)
5.65 eV
9.
Find the cut-off wavelength for the photoelectriceffect in tungsten (work function for tungsten is 4.5 eV)
a)
138 nm
b)
414 nm
c)
552 nm
d)
276 nm
10.
Green light with a wavelength of 5461 Å, emitted from a mercury lamp, ejects photoelectrons with a maximum kinetic energy of 0.13 eV from a metal surface. Calculate the work function of the metal.
a)
2.14 eV
b)
1.07 eV
c)
3.21 eV
d)
0.535 eV
11.
Green light with a wavelength of 5461 Å, emitted from a mercury lamp, ejects photoelectrons with a maximum kinetic energy of 0.13 eV from a metal surface.Calculate the cut-off wavelength of the metal
a)
290 nm
b)
580 nm
c)
145 nm
d)
435 nm
12.
Green light with a wavelength of 5461 Å, emitted from a mercury lamp, ejects photoelectrons with a maximum kinetic energy of 0.13 eV from a metal surface.Calculate the cut-off frequency of the metal
a)
0.517x1015 Hz
b)
0.258x1015 Hz
c)
0.129x1015 Hz
d)
0.646x1015 Hz
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