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Determine the number of photons with wavelengths between 705 and 713 nm escaping each second from...

Determine the number of photons with wavelengths between 705 and 713 nm escaping each second from a small opening in a cavity at a temperature of 9000 K. The opening behaves like a blackbody, and has a radius of 2.20 ✕ 10−2 mm.

---------------- photons/s

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