# analytical question

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One application of emission in remote sensing is in the detection of forest fires. The Landsat satellite has a sensor that detects active fires by examining their emission in the wavelength region of 1.55 μm to 1.75 μm.
a. What type of light is being detected by this sensor?
b. What are the energies (in kJ/mol) for photons of light at these wavelengths?

• analytical question -

I would call this the near infrared although this is the upper end of that region.
E = hc/wavelength in meters.
E is J/photon. Multiply by 6.02E23 to convert to J/mol photons and change that to kJ/mol.

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