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AP and TS EAMCET Engineering Model Paper 14
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© examsnet.com
Question : 115
Total: 159
Give the ascending order of slopes of graphs drawn between the following for a photo electric effect (Here
v
,
λ
are frequency and wave length of incident light)
a) Maximum KE electron on Y-axis;
1
λ
on X-axis
b) Stopping potential on Y-axis; v on X-axis
c)
1
λ
on X-axis; stopping potential on Y-axis
d) v on X-axis; KE of electrons on Y-axis
d, b, a, c
d, a, b, c
a, b, c, d
d, c, b, a
Validate
Solution:
a)
KE
=
hc
λ
−
W
⇒ slope = hc
b)
eV
0
=
h
v
−
W
⇒
V
0
=
(
h
e
)
v
−
W
e
⇒ Slope
=
h
e
c)
eV
0
=
hc
λ
−
W
⇒
V
0
=
(
hc
e
)
1
λ
−
W
e
⇒ Slope
=
hc
e
d) KE
=
h
v
−
W
⇒ slope = h
Ascending order of slopes : d, a, b, c
© examsnet.com
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