Question

calculate the kinetic energy of ejected electrons if white light with frequency 1X10^-15 HZ... strike on the metal surface and threshold frequency is 1X10^-16.​

Answer 1

Answer:

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We know that

K.E.=hv−hv

0

Given that

V=1.0×10

15

8

−1

,K.E.=1.988×10

−19

hv

0

=hv−KE

V

0

=

h

hv

−

h

KE

= v−

h

KE

= 10

15

−

6.626×10

−34

1.988×10

−19

V

0

=10

15

−0.3×10

15

= 0.7×10

15

V

0

=7×10

14

Answer 2

Answer:

We know that

K.E.=hv−hv

0

Given that

V=1.0×10

15

8

−1

,K.E.=1.988×10

−19

hv

0

=hv−KE

V

0

=

h

hv

−

h

KE

= v−

h

KE

= 10

15

−

6.626×10

−34

1.988×10

−19

V

0

=10

15

−0.3×10

15

= 0.7×10

15

V

0

=7×10

14

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