Tube light gives us photons due to excitement of electrons present inside the tube. This gives us a continuous emission spectrum but doesn't give us any absorption spectrum.
The hot filament of a bulb gives us a spectrum due to the excitement of electrons around the filament due to the high energy released by it. This too gives us a continuous emission spectrum but no absorption spectrum. Sun emits white light which causes a continuous emission spectrum. The elements present in the causing the sunlight gives us a line absorption spectrum.
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${}_1^3H \to {}_2^3He + {e^{ - 1}} + \bar v$
Atomic mass of ${}_1^3H$and ${}_2^3He$ are $3.016050\,u$ and $3.016030\,u$. Find the maximum possible energy of electron ....... $MeV$

| List $I$ | List $II$ |
| $I$ Doublet of sodium | $(A)$ Visible radiation |
| $II$ Wavelength corresponding to temperature associated with the isotropic radiation filling all space | $(B)$ Microwave |
| $III$ Wavelength emitted by atomic hydrogen in interstellar space | $(C)$ Short radio wave |
| $IV$ Wavelength of radiation arising from two close energy levels in hydrogen | $(D)$ $X-$ rays |
$STATEMENT-2$ Resistance of a metal increases with increase in temperature.