can spectrometer tell wavelength of band of monochromatic lights or can only tell wavelength of monochromatic light?
Dear Student,
It can tell only the wavelength of the monochromatic light.
A 200 W bulb emits monochromatic light of wavelength 1400 A and only 10% of the energy is emitted as light. The number of photons emitted by the bulb per second will be