We are going to calculate the number of photons required to raise the temperature of 2.1 g of water exposed to infrared radiation of wavelength 2.8×10−4 cm by 2.2 K.
We are going to do the following steps:
Step 1: Calculate the heat of the water
Step 2: Calculate the energy per photon
Step 3: Calculate the number of photons
Water is exposed to infrared radiation of wavelength 2.8×10−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons will be required to raise the temperature of 2.1 g of water by 2.2 K?
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