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Question 18N.3.SL.TZ0.2a

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.SL.TZ0.2a
Level SL Paper 3 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
18N.3.SL.TZ0.2a

In an experiment to measure the specific latent heat of vaporization of water Lv, a student uses an electric heater to boil water. A mass m of water vaporizes during time t. Lv may be calculated using the relation

L v = V I t m

where V is the voltage applied to the heater and I the current through it.

(a)

Outline why, during the experiment, V and I should be kept constant.

[1]

Markscheme

to provide a constant heating rate / power

OR

to have m proportional to t ✔

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