A beam of ultraviolet light of all wavelength passes through hydrogen gas at room temperature, in the x-direction. Assume that all photons emitted due to electron transitions inside the gas emerge in the y-direction. Let A and B denote the lights emerging from the gas in the x-and y-directions respectively. (i) Some of the incident wavelengths will be absent in A (ii) Only those wavelengths will be present in B which are absent in A (iii) B will contain some visible light (iv) B will contain some infrared light
A
some of the incident wavelenghts will be absent in A.
B
only those wavelengths will be present in which are absent in A
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