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WorksheetsDual nature of matter
Total questions: 25
Worksheet time: 26mins
The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light
Intensity
Wavelength
Frequency
Energy
A particle of light is called a...
Photoelectron
Photon
Proton
Electron
What color of light has the greatest energy per photon?
Red
Green
Blue
Violet
In photoelectric effect, electrons should be removed from the
inner shells
surface
from core
nucleus
What is the energy of a photon with a frequency of 5x1014 Hz? (you need to do calculation. You have enough time)
2.5x10-19 J
3.0x10-19 J
3.3x10-19 J
4.5x10-19 J
What is the best description of 'threshold frequency'?
The minimum energy needed for electrons to escape a surface.
The maximum kinetic energy that an emitted electron has.
The minimum frequency of a photon that will cause an electron to be emitted.
The frequency that an emitted electron will have.
According to the de Broglie hypothesis, which of the following statements is applicable to the
wavelength of a moving particle?
directly proportional to its energy
directly proportional to its momentum
inversely proportional to its energy
inversely proportional to its momentum
According to de Broglie, as the momentum of a moving particle is tripled, the corresponding
wavelength changes by what factor?
1/9
1/3
3
9
Starting from rest, an electron accelerates through a potential difference of 40 V. What is its de Broglie
wavelength? (h = 6.63*10-34 J×s, me = 9.11*10-31kg, and 1 eV = 1.60 * 10-19J)
1.1*10-10 m
1.5*10-10 m
1.9 * 10-10 m
2.3*10-10 m
If an electron has a measured wavelength of 0.850 * 10-10m, what is its kinetic energy?
(h= 6.63 *10-34 J×s, 1 eV = 1.6 *10-19J, and me = 9.11 * 10-31 kg
55.0 eV
104 eV
147 eV
209 eV
An electron microscope operates with electrons of kinetic energy 50.0 keV. What is the wavelength of
these electrons? Assume this speed is not relativistic.
9.28* 10-10 m
b.
7.14*10-11 m
5.49´ 10-12 m
2.75* 10-13 m
That light has a dual nature is referring to light:
having high- or low-energy photons.
acting as waves and particles.
having energy and momentum
undergoing pair production.
· All moving particles have a "matter wave" with a wavelength associated with them" This hypothesis has a name. Which?
Davisson and Germer hypothesis
De Broglie hypothesis
Schrödinger hypothesis
Bainbridge hypothesis
The relation between photocurrent and intensity of light is:
NONE
In nuclear reactors, neutrons travel with
energies of 5 × 10-21 J. Find their wavelength in A0
1.62
16.2
0.162
162
de-Broglie associated with an electron accelerated through a potential difference V is λ. What will be its wavelength when the accelerating potential is increased to 4V?
λ
λ/2
2λ
12.27 λ
electron volt is a unit of
potential
momentum
energy
charge
The theory, on the basis of Photoelectric effect can be explained
corpuscular theory
electromagnetic theory
wave theory
quantum theory
Which experimental setup helped De broglie to prove the hypothesis?
Bose-Einstein experiment
Davisson–Germer experiment
Plank-Maxwell experiment
Bohr-Rutherford experiment
Observation : Bright blue light liberates photoelectrons from
the surface of lithium but red light from the
same intensity does not give off any electrons
at all.
Explanation : Photons of blue light carry more energy than
photons of red light because the frequency of
blue light is higher than the frequency of red
light
DOES THE EXPLANATION EXPLAIN THE OBSERVATION?
YES
NO
Observation : Bright blue light liberates photoelectrons from
the surface of lithium but red light from the
same intensity does not give off any electrons
at all.
Explanation : The intensity of red light is not sufficient to
liberate photoelectrons
DOES THE EXPLANATION EXPLAIN THE OBSERVATION?
YES
NO
