Question
On its highest power setting, a microwave oven increases the temperature of 0.400 kg of spaghetti by $45.0\textrm{C}^\circ$ in 120 s. (a) What was the rate of power absorption by the spaghetti, given that its specific heat is $3.76 \times 10^3 \textrm{ J/kg}\cdot\textrm{C}^\circ$? (b) Find the average intensity of the microwaves, given that they are absorbed over a circular area 20.0 cm in diameter. (c) What is the peak electric field strength of the microwave? (d) What is its peak magnetic field strength?
1. $564 \textrm{ W}$
2. $1.80 \times 10^4 \textrm{ W/m}^2$
3. $3680 \textrm{ N/C}$
4. $1.23 \times 10^{-5} \textrm{ T}$
Solution Video