A microwave oven heats by radiating food with microwave radiation, which is absorbed by the water in the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 0.250 L of water is placed in the oven, and the temperature of the water rose by 60C.

How many photons of this microwave radiation was absorbed by the water?

Assume the density of water is 1.00 g/mL and its heat capacity is 4.18 J/gC)