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Question 19N.2.HL.TZ0.8a(iii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.HL.TZ0.8a(iii)
Level HL Paper 2 Time zone TZ0
Command term Describe Question number a(iii) Adapted from N/A
a(iii).
[Maximum mark: 2]
19N.2.HL.TZ0.8a(iii)

In a classical model of the singly-ionized helium atom, a single electron orbits the nucleus in a circular orbit of radius r.

(a(iii))

In this model the electron loses energy by emitting electromagnetic waves. Describe the predicted effect of this emission on the orbital radius of the electron.

[2]

Markscheme

the total energy decreases
OR
by reference to ETOT=-ke2r ✔

the radius must also decrease ✔

NOTE: Award [0] for an answer concluding that radius increases

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