I need help with just the first question. Thanks! The picture shows seven stella

Question

I need help with just the first question. Thanks!

The picture shows seven stellar ah orption spectra with type 3. 4pt Match the letter keated in the digital spectra above O at the top, B next, and so on down to M at the bottom. Only (in the second pieture) with the correet statement about each the blue part of the spectrum is shown. The strength of the speetrum. (If the first statement corresponds to speetrum A line is dotermined by how dark the line is. In the next problem and the rest to B, then enter ABBBBBB) is shown a digital version of the same spectra in randomized order. The intensity is the vertical axis. In both pictures, the 1) Lines of easily ionized elements like singly ionized caleium are strong: hydrogen lines are weak beeanse it is not hot enough for hydrogen to be in the n-2 state. 2) Lines of ionized helium; most lines are weak beeause the star is so hot most electrons are removed from atoms and there are few atoms making transition 3) Hydrogen lines very strong and dominate the speetrum. 4) Many lines of neutral elements and molecular states. 5) Singly ionized Caleium (393.0 nm) and a hydrogen line 434.0 nm) are about equal strength. 6) Lines of neutral elements strongest. Singly ionized caleium lines are weaker, but still present. 7Lines of neutral helium. Hydrogen lines moderately strong . Apt Give the speetral type (OBAFGK or M) of the stars which produced the digital spectra shown in the second picture. If the top spectrum corresponds to K, the next to G, and the 1. 4pt Match the letter of the digital spectrum with the number of the photographie speetrum. (Speetrum (1) refers to the ie s labeled (1) in the first picture.) 5. [4pt] Choose the correct statements concerning spectral classes of stars. (Give ALL correet answers, ie., B, AC, BCD... A) The speetral sequence has recently been expanded to in- clude L, T, and Y classes. B) K-stars are dominated by lines from ionized helium be- cause they are so hot. C) Oh Be A Fine Guy/Girl Kiss Me, is a mnemonic for re- membering speetral elasses. D) Hydrogen lines are weak in type O-stars beeause most of it is completely ionized. E) Neutral hydrogen lines dominate the spectrum for stars with temperatures around 10,000 K beeause a lot of the hy drogen is in the n-2 level. F) The spectral types of stars arise primarily as a result of differences in temperature. 6. 4pt Choose the correet statements concerning the eloe- tromagnetie spectrum given off by stars. (Give ALL correet answers, ie., B, AC, BC) 1) spectrum (4) 2) spectrum (3) 3) spectrum (7) 4) spectrum (2) 5) spectrum (1) 6) spectrum (6) 7) spectrum (5) A) All stars are the same color as our Sun. B) Blue photons (blue light) have a longer wavelength than red photons. C) If we see a blue star and a red star in a nearby star eluster we know the red star is hotter D) Hot stars are much brighter than cool stars of the same size and distance from the Earth. E) Blue photons are more energetie than red photons. F) A hot star will be more blue in color than a cooler star

Explanation / Answer

1.

In first three spectra only three lines appear (See only broader lines). We can see three graphs A, C, and F which have similar patterns in them. See the width of the lines, match this width with the widths in the graph. They are in increasing order of their widths.

1) A

2) C

3) F

Fourth spectrum has only one extra line than the previous spectra. This corresponds to graph G.

4) G

Spectra 5 and 6 have two lines less as compared to spectrum 4. These are matched to graphs B and E respectively.

5) B

6) E

For 7, D is the only option remaining.

7) D

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