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

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.HL.TZ0.a(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.a(iii)

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

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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