Atypical laboratory diffraction grating has 5.00x10^3lines/cm and these lines are contained in a 3.5cm width of grating. a. what is the chromatic resolving power of such a grating in the first order . b. could this grating resolve the line of the sodium doublet in the first order? while doing spectral analysis of a star you ate using this grating in the secondorder to resolve spectral lines that are very close to the 587.8002 nm spectral line of iron 1 for wavelength longer than the iron line . what is the shortest wavelength you could. distinguish from the iron line. for wavelength shorter than the iron line what is the longest wavelength you could distinguish from the iron line

Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?

It is really hard for me right know

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