Question

the most energetic electrons emitted from a surface by 3500 angstrom photons are found to be bent in 0.18 cm circle by a magnetic field of 1.5 into 10 to the power minus 15 Weber metre square calculate the work function for the material​

Answer 1

Answer:

The Einstein's equation for photoelectric effect : K=

λ

hc

−W

Now, K=

λ

1

hc

−W....(1)

and 2K=

λ

2

hc

−W....(2)

So,

λ

1

2hc

−2W=

λ

2

hc

−W [using (1)]

or W=hc[

λ

1

2

−

λ

2

1

]=(6.62×10

−34

)(3×10

8

)[2/400−1/310]×10

9

=3.52×10

−19

J=2.2eV as

[1eV=1.6×10

−19

J]