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

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

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.

(b)

Outline whether the value of Lv calculated in this experiment is expected to be larger or smaller than the actual value.

[2]

Markscheme

due to heat losses «VIt is larger than heat into liquid» ✔

Lv calculated will be larger ✔

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