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WorksheetsEinstein Photoelectric Theory
Total questions: 10
Worksheet time: 20mins
Which of the following statements is correct about the photoelectric effect?
The photoelectric effect can only occur on light sources having a high intensity.
The photoelectric effect occurs at a certain frequency value of a light wave.
The emitted electrons take a long time if using a dim light source.
Electrons in the metal absorb momentum to be emitted out.
What is the function of the arrangement?
To determine the wavelength of the Red LED.
To determine the value of the Plank's constant
To determine the threshold frequency
To show the relationship between current and potential difference
The graph shows current against voltage. What is P?
Junction voltage
Potential difference
Threshold frequency
Activation voltage
Figure shows a green light with a wavelength of 550 nm irradiated on the surface of sodium metal.
Why are no electrons emitted from the surface of sodium?
The intensity of green light is insufficient
The frequency of green light does not exceed the threshold frequency of sodium metal
The wavelength of the light used is too small
The kinetic energy of electrons is insufficient
What happens to an electron when it receives energy from a photon at a threshold frequency fo?
Electrons are not released
Electrons are released momentarily then reabsorbed into the metal
Electrons are released without any kinetic energy
Electrons only vibrate at fixed positions
Calcium, Ca has a work function, W = 2.87 eV. If a photon is irradiated on the surface of a calcium metal with frequency 7.8 x 1014 Hz, what is the maximum kinetic energy of the electrons emitted?
0.36 eV
1.25 eV
3.34 eV
6.10 eV
A ray is irradiated on the surface of a lithium metal having a work function 4.7 x 10-19 J. If the maximum kinetic energy of the emitted electron is 3 x 10-20 J, what is the wavelength of the ray?
380 nm
398 nm
420 nm
550 nm
Figure shows a graph for the maximum kinetic energy, K against frequency, f for the metal Potassium, K.
Based on the figure, what is the threshold wavelength for the metal Potassium, K?
4.84 x 10-7 m
3.85 x 10-7 m
5.45 x 10-7 m
6.00 x 10-7 m
Figure shows a graph for the maximum kinetic energy, K against frequency, f for the metal Cesium, Cs.
What is the velocity of a photoelectron if green monochromatic light (f = 6.5 x 1014 Hz) is irradiated on the surface of a clean Cesium, Cs metal?
4.23 x 105 m s-1
5.13 x 105 m s-1
5.93 x 105 m s-1
6.54 x 105 m s-1
Electrons are emitted from a clean nickel metal surface with a kinetic energy of 0.12 eV at 100% light intensity. What is the kinetic energy of an electron emitted if the light intensity is 50%?
0.12 eV
0.24 eV
0.06 eV
0.00 eV
