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Summary Modern Physics
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Handwritten cheat sheet for Modern Physics by JEE 2020, GATE, CSIR topper
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atharvashinde
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Camlinj PaneDate
Modexn Physice
he phenomenon of emission of e hom th
Gusfoce of cextain Subsance,when odiahon
of cextain y e incident is called
phato electie ott
AVaiaion of photoelecic cuent with PD
At O Potenhal, a cubrent
existst means ea
emitted with di E
Anode poent iaJ
2 Anode potential T, Curet T, > diE kE energy
z Affex cestain anede potential curTent agures
acansta alue called satuschion cment
dt aquiies
Lof
a satuaion
pex se,
yalue beoz he na
nc.
tom cathode ae fxed
4 At Cextain -Ve potential cuTent =O
hic ic called stoppdngpolenbal Va
MaK. k.E. oF
the emittec e KEmak eVa
Photoedecic
htenaity
H
, Date
Satusation cubaent T with 1 in intensity
Sopping
Gseate potential is independen of indens
he y greater he sopping pethhal
Thexe exists a estain mun. bebas whiçh
no stopping potenhial is regured as no.
emissio Yfe takeg place Thus is alled
thssshold called
Fox emission to take phce
Failuae of wWave Theoxy of ight
J. Acc. to wave heoy when b¡ht incident on
is distibuted contnuously oves
he susface Butaceenergt has to cwaif toD galn
suhciet enesy to come out. But in expt
herels no time. lag. This meanB, edoesn't
absoxb enexny. hea ge all enexay at once
2
energet ee should
be emitted. So that stopping patenthia should
be intensity dependert. But is not obseed
hearg, iF ntensity is sufiuent,
at each e emissioD ispossible, t means
thexe chould not be ex0Btence of hreshald
feayeng
EinsBein's Explainahontakes place due to
The ene tarnsfex
colsion betran &proton The e
30
Lneedg a cextain min eney to escape rom
he pul
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