Problem: 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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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


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Problem Details

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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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Photoelectric Effect concept. You can view video lessons to learn Photoelectric Effect. Or if you need more Photoelectric Effect practice, you can also practice Photoelectric Effect practice problems.

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Based on our data, we think this problem is relevant for Professor Sanders' class at University of Saskatchewan.