Question

Calculate the frequency of light that has a wavelength of 600 nm?



4.99 x 1014 Hz



6.24 x 1014 Hz



5.1 x 109 Hz



4.99 x 10 -14Hz

Answer 1

Answer:

5.1 x 109 Hz

Explanation:

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Answer 2

Answer:

To find the energy of a photon you use the Planck Expression:

E

=

h

f

h

is the Planck Constant which =

6.63

×

10

−

34

x

J

.

s

f

is the frequency

This becomes:

E

=

h

c

λ

c

is the speed of light =

3.00

×

10

8

x

m/s

λ

is the wavelength

∴

E

=

6.63

×

10

−

34

×

3.00

×

10

8

490

×

10

−

9

x

J

E

=

4.00

×

10

−

19

x

J

If 1 Coulomb of charge is moved through a potential difference of 1 Volt then 1 Joule of work is done.

The electron volt is the work done in moving 1 electron through a potential difference of 1 Volt.

The charge on the electron is taken here to be

1.60

×

10

−

19

x

C

∴

1

eV

=

1.60

×

10

−

9

x

J

∴

The energy of the electron in electron volts

=

4.00

×

10

−

19

1.60

×

10

−

19

=

2.5

x

eV