Physics work: Light, The Photoelectric Effect

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Part 1:
Communicate confutations to 2 momentous figures. Take the accelerate of volatile as 3.0 ? 108 m/s.
Reading Season: 5 minutes. Writing Season: 25 minutes
Confutation perfect inquirys in the interinterinterboundlessness granted adownneathneath each inquiry.
If you don?t end the meekness in the season perfectowed then haul a blushing direction adownneathneath that product and end
off the inquirys. You must restraintce perfect inquirys precedently submitting this product. If you end the
meekness inquirys amid the season perfectowed haul a blushing direction adownneathneath your developed disintegration.
1.
(a) Portglow the force-boundlessness graph restraint the
diffraction mould if a blushing volatile is portraitusanguine in a
single slit trial.
(b) Portglow the force-boundlessness graph restraint the
interlocution mould if a blushing volatile is portraitusanguine in a
double slit trial.
Compare your graphs.
(3 marks)
Graphs and comments required.
2.
Complete the controlthcoming consideration and communicate confutations in scale restraintm.
Formula and anticipation requiblushing in mismisappropriate buffet adown.
(6 marks)
Source
(a) Infra-blushing from
CO2 laser
Wavelength
Frequency
10.6 ?m
(b) Yellow volatile
5.0 ? 10-7 m
(c) Violet volatile
7.1 ? 1014 Hz
(d) Blushing volatile
680 nm
(e) Gamma glow
3.0 pm
(f) AM radio wave
1.0 ? 104 Hz
3.
Complete the controlthcoming consideration and recite whether each recitement is True or False.
No producting required
Statement
(6 marks)
True or
False
(a) The behaviour of volatile, chiefly disradiation, diffraction and two-slit interlocution, is
strong exemplification restraint the grain specimen.
(b) In an interlocution mould, a clime of strenuous volatile or maxima results from a path
difference of 0, ??? ?2?? ?3?? ???
(c) Radio waves diffract momentously environing objects such as considerations and chairs.
(d) Visible volatile does appealable diffract momentously environing smperfect cells (? 10-7m)
(e) The wave specimen of volatile predicts that volatile should trip faster in a vacuum than in zeal.
(f) Decreasing the slit disconnection increases the spacing of interlocution fringes.
The controlthcoming counsel applies to inquirys 4 ? 8.
A learner sets up a Young?s slit trial in which yellow volatile of wavelength 589 nm is
incident on two scrutinizing slits whose disconnection is 1.0 ? 10-4m. An interlocution mould is restraintmed
at a hide 2.0m from the slits.
4.
In the interinterinterboundlessness on the present page observation the interlocution diagram from Page 10.7 in this week?s
chapter. However, instead of hauling waves at R where constructive interlocution occurs, haul
the waves at apex N where deleterious interlocution takes fix.
Haul no over than 4 waves betwixt the slits and the hide (on Page 10.7 some 14 waves
have been hauln)
Well labelled diagram showing the waves arriving at N
(2 marks)
5.
Rate the spacing of each fringe, in cm.
Formula anticipation
(2 marks)
cm
6.
Relate the consequence on the fringe spacing by (a) increasing the slit disconnection. (b) increasing the
boundlessness of the hide from the slits.
Answers Restraintmula explanation
(2 marks)
(a)
(b)
7.
If the slit disconnection and hide boundlessness are kept continuous, relate the consequence on the fringe
spacing if:
Orange volatile is substituted restraint the yellow volatile.
Confutation Restraintmula explanation
(2 marks)
8.
The clearness of the yellow volatile spring is increased.
Confutation Restraintmula explanation
(2 marks)
Part 2
Communicate confutations to 2 momentous figures. Take the accelerate of volatile = 3.0 ? 108 m/s.
Reading Season: 5 minutes. Writing Season: 25 minutes
Confutation perfect inquirys in the interinterinterboundlessness granted adownneathneath each inquiry.
If you don?t end the meekness in the season perfectowed then haul a blushing direction adownneathneath that product and end
off the inquirys. You must restraintce perfect inquirys precedently submitting this product. If you end the
meekness inquirys amid the season perfectowed haul a blushing direction adownneathneath your developed disintegration.
Appeal to the controlthcoming facts where required:
Mass of electron m = 9.1 ? 10-31kg; advise on electron e = 1.6 ? 10-19C;
accelerate of volatile, c = 3.0 ? 108 ms-1
Planck?s Continuous h = 6.6 ? 10-34Js, or h = 4.1 ? 10-15eVs; 1 nm = 1 ? 10-9m; 1 pm = 1 ? 10-12m
Questions 1 ? 4 appeal to the controlthcoming counsel.
Volatile of quantity 1.3 ? 1015 Hz strikes a metal deportment with a product business of 3.0 ? 10-19J.
1.
Rate the photon ardor in (a) Joules and (b) eV.
Formula(s) and anticipation required
(2 marks)
(a)
J
(b)
2.
Rate the commencement quantity of the metal
eV
Formula(s) and anticipation required
(2 marks)
Hz
3.
Rate the culmination ardor of the photoelectrons. Communicate confutation in Joules.
Formula(s) and anticipation required
(2 marks)
J
4.
What is the skin voltage restraint this metal deportment?
Formula(s) and anticipation required
(2 marks)
V
Questions 5 and 6 appeal to the controlthcoming counsel.
The culmination ardor of photoelectrons emitted from a zinc metal platter is shown adown. Volatile
of quantity 1.2 ? 1015 Hz shines onto the zinc platter.
6
KEMAX
4
KE (Max)
(?10-19 J)
2
0
-2
-4
-6
-8
0
2
4
6
8
10
12
Frequency
5.
14
16
18
20
(? 1014 Hz)
Using the graph, meet the (a) commencement quantity, and (b) Product Business restraint the zinc platter.
(2
marks)
(a)
Hz
(b)
J
6.
Using the graph, rate the estimate of Planck?s continuous (Js).
Anticipation required
marks)
(2
Js
Questions 7 ? 9 appeal to the controlthcoming counsel.
Yellow volatile of wavelength 652 nm is shone onto the deportment of the photocathode of a metal called
Metallica in a photocell. The graph of the photoelectric vulgar versus voltage is shown adown.
current
-0.2V
voltage
nt
7.
Rate the estimate of the product business of Metallica in electron-volts.
Formula(s) and anticipation required
(3 marks)
eV
8.
On the graph aloft portglow the deflexion expected if:
(a) Yellow volatile is alterable to ultraviolet with a inferior forcethan the initiatory (portraiture cerulean
ink).
(b) Yellow volatile is alterable to infra-blushing with a surpassing force than the initiatory (portraiture blushing ink
(2 marks)
9.
The graph aloft has been reproduced adown. On this graph portglow the deflexion expected if:
(a) if a over strenuous (brighter) yellow volatile is shone onto Metallica (portraiture cerulean ink).
(b) If a less strenuous (dimmer) yellow volatile is shone onto Metallica (portraiture blushing ink).
current
(2
marks)
-0.2V
Voltage
10. Rate the ardor, in keV, of a gamma glow with a wavelength of 3.0 pm?
Formula and anticipation required
(2 marks)
keV
Questions 11 ? 13 appeal to the controlthcoming counsel.
An X-glow photon of ardor 18.0 keV collides with a quiescent electron. The ardor of the dissolute
photon is 16.0 keV.
11. Rate the momentum of the X-glow photon precedently the opposition.
Formula and anticipation required
(2 marks)
Ns
12. Rate the kinetic ardor, inkeV, of the electron behind the opposition.
Formula and anticipation required
mark)
(1
eV
13. What is the accelerate of the scatteblushing photon?
Explain your confutation
mark)
(1
ms-1

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