What region of the electromagnetic spectrum (or to what wavelength scale) is necessary to measure a wavelength shift (and why)?
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The wavelength of the visible light and UV light cover a range from 400-800nm and 200-400nm, respectivley. A spectrophotometer is an instrument that measures the amount of photons (the intensity of light) absorbed after it passes through sample solution. With the spectrophotometer, the amount of a known chemical substance (concentrations) can also be determined by measuring the intensity of light detected. a. In visible spectroscopy, the absorption or the transmission of a certain substance can be determined by the observed color. Violet has wavelength around 380 nm. If planck's constant (h) is 6.626x10-34 Js and speed of light c is 3x10^8 m/s, how much is photon energy of violet (eV) ? (It is known that the photon energy unit eV = 1.6x10-19 J) b. UV spectroscopy is type of absorption spectroscopy in which light of ultra-violet region (200-400 nm) is absorbed by the molecule which results in the excitation of the electrons from the ground state to higher energy state. What molecules that can absorb light in UV region? What are the possible transisition of electron in this molecule?
Sri K.
(a) What is the relationship between the wavelength and the frequency of radiant energy? (b) Ozone in the upper atmosphere absorbs energy in the $210-230-\mathrm{nm}$ range of the spectrum. In what region of the electromagnetic spectrum does this radiation occur?
A fringe pattern, such as that in Figure $20,$ found using an interference microscope objective, is observed to have a regular spacing of $1 \mathrm{mm} .$ At a certain point in the pattern, the fringes are observed to shift laterally by $3.4 \mathrm{mm}$. If the illumination is green light of $546.1 \mathrm{nm}$, what is the dimension of the "step" in the film that caused the shift?
Penny R.
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