Question is ⇒ Luminous flux is, Options are ⇒ (A) the light energy radiated by sun, (B) the part of light energy, radiated by sun, which is received on the earth, (C) the rate of energy radiation in the form of light waves, (D) none of the above, (E) , Leave your comments or Download question paper.
Apr 28, 2020 · [4] [5] As a photon source, he used a helium discharge lamp which emits a wavelength of 58.4 nm (corresponding to an energy of 21.2 eV) in the vacuum ultraviolet region. With this source Turner's group obtained an energy resolution of 0.02 eV.
Such line spectra can be observed by passing the light from a gas-discharge lamp through a spectrometer, containing a glass prism or a diffraction grating as the light-dispersing element. The pattern of lines (their wavelengths and relative intensities) is characteristic of the type of gas emitting the light (Fig. 3.14).
Planck recognized that the energy levels of the emitting atoms and molecules were quantized, with only the allowed values of [latex]E=\left(n+\frac{1}{2}\right)\text{hf}\\[/latex], where n is any non-negative integer (0, 1, 2, 3, …). h is Planck’s constant, whose value is h = 6.626 × 10 −34 J · s.