Light from a sodium lamp is passed through cold sodium vapours, the spectrum of transmitted light consists of what spectral lines?
Light:
Explanation:
Thus, no spectral features.
Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60 % of the consumed energy is converted into light. Wavelength of sodium light = 590 nm.
The source of ultraviolet light is :
(a) electric bulb (b) red hot iron ball
(c) sodium vapour lamp (d) Carbon arc - lamp.