Correct option is B
The amount of heat Q absorbed or released when a material changes temperature is given by:
Q = m × c × ΔT,
where m is the mass in kilograms, c is the specific heat capacity (J kg⁻¹K⁻¹), and ΔT is the change in temperature in Kelvin or °C. Here:
· m = 200g = 0.2 kg
· c = 450 J kg⁻¹K⁻¹ (for iron)
· ΔT = 60 – 30 = 30 K
So,
Q = 0.2 × 450 × 30
First calculate 0.2 × 450 = 90.
Then 90 × 30 = 2700 J.
