Answer:
option (B)
Explanation:
Power, P = 600 W
mass of water, m = 250 g = 0.250 kg
T1 = 20° C
T2 = 80° C
ΔT = 80 - 20 = 60
specific heat of water, c = 4200 J/kg °C
Let the time taken is t.
Power x time = mass of water x specific heat of water x rise in temperature
600 x t = 0.250 x 4200 x 60
t = 105 second
option (B)
