Pcs 181 ch 9

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Toronto Metropolitan University *

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181

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Chemistry

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Dec 6, 2023

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2

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Pcs 181 ch 9 You would use the 21-cm radio emission line to map out atomic hydrogen clouds The above image is an example of a protostellar disk Absorption lines due to the interstellar medium indicate that some components of the interstellar medium are cold and of a very low density because the lines are extremely narrow Which of the following is NOT evidence of the existence of an interstellar medium? molecular absorption lines in the spectra of cool stars is a. extinction of light from distant stars b. very narrow calcium absorption lines in the spectra of O and B stars c. reddening of more distant stars d. dark cloud silhouetted against background stars How long can a four-solar-mass star live? b. 0.03125 solar lifetimes In the above cartoon image of Orion, where would you find the Orion nebula? below the belt (i.e., three white stars) but above the lower right blue and lower left white stars The above visual wavelength image is of a Bok globule, which is a(n)empty space Why do nuclear fusion reactions only take place in the interior of a star? The temperature is the hottest in the center and the density of material is very high in the center How long can a 1-solar-mass star live? 1 solar lifetime What causes the outward gas pressure that balances the inward pull of gravity in a main- sequence star? he high temperature and the high density of the gas As a star begin to form the initial energy source is from gravitational potential energy If the dust around a protostar radiates most strongly at 30 microns or 30,000 nm, what is the approximate temperature of that dust? Hint: T in K = 3,000,000/wavelength in nm or use Wien’s Law 100 K Which of the following energy transport processes involves mass motions of material? Convection
Due to the dust in the interstellar medium, a distant star will appear to an observer on Earth to be fainter and cooler than it really is A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star? 20,000 AU in the Herbig-Haro object shown above, the Herbig-Haro is the white/blue colored interstellar medium the red jet runs into What is the lifetime of a 10-solar-mass star on the main sequence? 3.2 × 10 7 years Which is the correct evolutionary order? protostar, YSO, ZAMS Star may appear fainter due to the interstellar medium. This effect is known as interstellar extinction The above image is an example of a/an dark nebula While on the main sequence a star's primary energy source comes from nuclear fusion A ZAMS star is located on the lower edge of the main sequence You would like to see through the dust in a cloud to find protostars. Which band of the electromagnetic spectrum would you need to look in? Infrared The above visual wavelength image of the Trapezium cluster shows main sequence and protostars What is the lifetime on the main sequence of a 2-solar-mass star compared to the approximately 10-billion-year life of our Sun? Pick the best answer 1.8 × 10 8 years
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