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Light (E.M. wave) In most spectroscopies, we characterize how a sample modifies light entering it. 1) Absorption: Change in intensity I of incident light Sample attenuates light → transmission T=I/I0 We measure the absorption of light at different frequency or wavelength. ω/λ/ν (characteristic frequency/wavelength of light entering sample)
The amount of light of a given colour (or wavelength) that is emitted by a body depends on its temperature. And since all macroscopic bodies have a temperature above absolute zero, all of
1. All waves of electromagnetic spectrum travel in vacuum with speed of light i.e. 3 x 108m/s. 2. The relation between the wavelength, speed and frequency of electromagnetic waveis given by c = f λ. 3. All waves show the properties of reflection, refraction, interference and diffraction. 4.
Wavelengths of visible light are often given in nanometers, nm. One nm equals 10 −9 10 −9 m. For example, yellow light has a wavelength of about 600 nm, or 6 × 10 −7 6 × 10 −7 m.
Chemistry Worksheet and Answers Wavelength, frequency, & energy of electromagnetic waves. C = λν. C = 3.00 x 108 m/s. E = hν h = 6.626 2 x 10-34 J-s (or J/Hz) 1. What is the wavelength of a wave having a frequency of 3.76 x 1014 s-1?
Consider the two closely spaced spectral (yellow) lines of sodium (Na), l 1 = 589 nm and l 2 = 589.6 nm. If light from a sodium lamp fully illuminates a diffraction grating with 4000 slits/cm, what is the angular separation of these two lines in the second-order (m=2) spectrum?
As examined in a later chapter, the shorter the wavelength of light, the greater the energy change of an atom or molecule that absorbs the light in an electronic transition. This makes short-wavelength ultraviolet light damaging to living cells.
