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A beam of ultraviolet light of all wavel...

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 wavelengths willbe absent in A

B

only those wavelengths will be present in B which are absent in A

C

B will contain some visible light

D

B will contain some visible light

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