Question
On its high power setting, a microwave oven produces 900 W of 2560 MHz microwaves. (a) How many photons per second is this? (b) How many photons are required to increase the temperature of a 0.500-kg mass of pasta by $45.0 \textrm{ C}^\circ$ , assuming a specific heat of $0.900 \textrm{ kcal/(kg}\cdot \textrm{C}^\circ\textrm{)}$ ? Neglect all other heat transfer. (c) How long must the microwave operator wait for their pasta to be ready?
1. $5.31 \times 10^{26} \textrm{ photons/s}$
2. $4.99 \times 10^{28} \textrm{ photons}$
3. $94.2 \textrm{ s}$
Solution Video