Question text
19 A 100g piece of solid lead at room temperature is heated. After 22s, it has all become liquid. The graph shows how its temperature varies with time. 400 temperature / °C 300 200 100 0 0 5 10 15 20 25 time / s The power of the heater is 320W. Which expression gives the specific latent heat, in J/kg, of the lead? 7.0 × 320 22 × 320 7.0 × 320 22 × 320 A B C D 0.10 × 300 0.10 × 300 0.10 0.10
19 A 100g piece of solid lead at room temperature is heated. After 22s, it has all become liquid.
The graph shows how its temperature varies with time.
400
temperature
/ °C
300
200
100
0
0 5 10 15 20 25
time / s
The power of the heater is 320W.
Which expression gives the specific latent heat, in J/kg, of the lead?
7.0 × 320 22 × 320 7.0 × 320 22 × 320
A B C D
0.10 × 300 0.10 × 300 0.10 0.10
Select your answer: