If it takes 10.2 eV of energy excite hydrogen from the ground state into the first excited (n = 2) state, then what frequency photon is required to excite hydrogen out of the ground state into n = 2 state? What is the wavelength (λ) of that photon? What kind of radiation (region of the electromagnetic spectrum) is this photon?

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Blackbody

Q.5 A blackbody radiates how much energy when the temperature of the body is elevated?