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Physics
Physics
Problem
The photo electric emission requires a threshold frequency
ν
0
\nu_0
ν
0
. For a certain metal
λ
1
=
2200
A
˚
\lambda_1 = 2200 \text{ \AA}
λ
1
=
2200
A
˚
and
λ
2
=
1900
A
˚
\lambda_2 = 1900 \text{ \AA}
λ
2
=
1900
A
˚
produce electrons with a maximum kinetic energy
K
E
1
KE_1
K
E
1
and
K
E
2
KE_2
K
E
2
. If
K
E
2
=
2
K
E
1
KE_2 = 2KE_1
K
E
2
=
2
K
E
1
, calculate
ν
0
\nu_0
ν
0
and corresponding
λ
0
\lambda_0
λ
0
.
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