Question

163. An electron travels with a velocity of v ms.
For a proton to have the same de Broglie
wavelength, the velocity will be approximately
V
1840
(1) en (2) (3) 1840 v (4) v
164. Which of the folowing relates to photons both
as wave motion and as a stream of particles?
(1) Interference (2) E=mc2
(3) Diffraction
(4) Erhv
1.
andnoon
oli​

Answer 1

Answer:

De Broglie wavelength λ=

2mK

h

where K is the kinetic energy.

Kinetic energy K=eV

We get λ=

2meV

h

⟹ λ∝

mV

1

........(1)

Given : V

1

=V m

1

=m m

2

=M V

2

=9V

From equation (1), we get

λ

1

λ

2

=

m

2

V

2

m

1

V

1

Or

λ

λ

2

=

M(9V)

mV

⟹ λ

2

=

3

λ

M

m

October 15, 2019

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