Question #57398

a)

Calculate the ionisation energy of rubidium per atom, if light of wavelength 5.84

10

8

m

produces electrons with a speed of 2.450

10

6

ms

1

.

(5)

[

Hint:

Assume that the thres

hold frequency refers to the frequency corresponding to the

ionisation energy.]

b)

Assume that the electron in Li

2+

ion is in third orbit. Calculate

(5)

i)

the radius of the orbit, and

ii)

the total energy of the electron

[Hint:

Li

2+

ion also has at

omic spectra similar to hydrogen atom. while applying relevant

equations, use

Z

= 3

Calculate the ionisation energy of rubidium per atom, if light of wavelength 5.84

10

8

m

produces electrons with a speed of 2.450

10

6

ms

1

.

(5)

[

Hint:

Assume that the thres

hold frequency refers to the frequency corresponding to the

ionisation energy.]

b)

Assume that the electron in Li

2+

ion is in third orbit. Calculate

(5)

i)

the radius of the orbit, and

ii)

the total energy of the electron

[Hint:

Li

2+

ion also has at

omic spectra similar to hydrogen atom. while applying relevant

equations, use

Z

= 3

Expert's answer

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