Consider this... Range Figure 3 Emission spectra of incandescent (Weft) and fluo
ID: 542736 • Letter: C
Question
Consider this... Range Figure 3 Emission spectra of incandescent (Weft) and fluorescent (right light bulbs 200 400 600 800 200 400 600 800 Wavelength (nm) Wavelength (nm) Key Questions 11. Over what wavelength range would each light bulb be a source of light for an absorption measurement? pla res cent, at point, o.SSo, 6 10 n..^ 12. Describe how intensity changes as wavelength increases for each source. In other words, are the ntensities uniform? 13. At 525 nm, which is the better light source? State your evidence. n Candestent is rins Continuous light sources change smoothly from one wavelength to the next. On the other hand, line sources produce narrow bands or lines of intense radiation. 14. Describe how an incandescent light bulb can be a continuous source in the visible region of the 138Explanation / Answer
a) The light source is emitting the radiation with the wavelength in the range of 400nm-800nm and the flourescent light emission takes place in the interval of 400nm to 600nm.
b) In case of incandescent light the wavelength is continuous and there are intensity maximum in all wavelength in between. But in flourscent light the wave length is not continous. There are intensity maximum in only certain wavelengths.
c) At 525nm the flourscent light is better light source becasue it is emitting a radiation with single wavelength and we will get radiation with exactly 525nm wavelength.
d) Incandescent light emits radiation with energy of nearly all wavelengths. The intensity maximum is spreaded to all the available wavelengths without any break. So it continuous source in the electromagnetic spectrum.