Question

Q.21 An electron is revolving in 4th orbit of He ion. Find
(a) Radius of 4th orbit.
(b) Velocity of the electron revolving in 4 orbit in m/sec.
(c) Energy of electron revolving in 4th orbit in Joule and eV(electron volt).
(d) Kinetic energy of electron in the 4th orbit.
(e) Potential energy of electron in the 4th orbit.​

Answer 1

Answer:

We know, r

n

=

4Π

2

ne

2

Z

n

2

h

2

now, mur

n

=

2Π

nh

⇒v=

2Π

nh

×

m

1

×

n

2

h

2

4Π

2

me

2

Z

=

nh

2Πe

2

Z

∴1094×10

5

=

4×6.625×10

−27

2×3.14×9.11×10

−28

×Z

⇒Z≃2

∴ The atom may be He .