21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 15.1, Problem 15.1CYU
To determine
What happened to the visible light when it passes through the interstellar medium.
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As frequency increasesa) wavelength increases
b) energy increases
c) wavelength decreases
d) speed of light changes
e) b and c are both true
a
The distance between A and B
b
The distance between A and D
c
The distance between midpoints D, E, and F
d
The light bands between D and E and F
The Hα line in hydrogen has a wavelength of 656.20 nm. This line differs in wavelength from the corresponding spectral line in deuterium (the heavy stable isotope of hydrogen) by 0.18 nm. (a) Determine the minimum number of lines a grating must have to resolve these two wavelengths in the first order. (b) Repeat part (a) for the second order.
Chapter 15 Solutions
21st Century Astronomy
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QPCh. 15 - Prob. 2QPCh. 15 - Prob. 3QPCh. 15 - Prob. 4QPCh. 15 - Prob. 5QPCh. 15 - Prob. 6QP
Ch. 15 - Prob. 7QPCh. 15 - Prob. 8QPCh. 15 - Prob. 9QPCh. 15 - Prob. 10QPCh. 15 - Prob. 11QPCh. 15 - Prob. 12QPCh. 15 - Prob. 13QPCh. 15 - Prob. 14QPCh. 15 - Prob. 15QPCh. 15 - Prob. 16QPCh. 15 - Prob. 17QPCh. 15 - Prob. 18QPCh. 15 - Prob. 19QPCh. 15 - Prob. 20QPCh. 15 - Prob. 21QPCh. 15 - Prob. 22QPCh. 15 - Prob. 23QPCh. 15 - Prob. 24QPCh. 15 - Prob. 25QPCh. 15 - Prob. 26QPCh. 15 - Prob. 27QPCh. 15 - Prob. 28QPCh. 15 - Prob. 29QPCh. 15 - Prob. 30QPCh. 15 - Prob. 31QPCh. 15 - Prob. 32QPCh. 15 - Prob. 33QPCh. 15 - Prob. 35QPCh. 15 - Prob. 36QPCh. 15 - Prob. 37QPCh. 15 - Prob. 38QPCh. 15 - Prob. 39QPCh. 15 - Prob. 40QPCh. 15 - Prob. 41QPCh. 15 - Prob. 42QPCh. 15 - Prob. 43QPCh. 15 - Prob. 44QPCh. 15 - Prob. 45QP
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- Object A is hotter than object B. The light emitted from object A is (a) hotter than the light from object B (b) has a higher maximum wavelength than object B (c) has a lower maximum wavelength than object B (d) is cooler than object Barrow_forwardGo outside on a clear night, wait 15 minutes for your eyes to adjust to the dark, and look carefully at the brightest stars. Some should look slightly red and others slightly blue. The primary factor that determines the color of a star is its temperature. Which is hotter: a blue star or a red one? Explainarrow_forwardAn idealized radiating object does not reflect or scatter any radiation but instead absorbs all of the electromagnetic energy that falls on it. Can you explain why astronomers call such an object a blackbody? Keep in mind that even stars, which shine brightly in a variety of colors, are considered blackbodies. Explain why.arrow_forward
- What is the temperature of a star whose maximum light is emitted at a wavelength of 290 nm?arrow_forwardNarrow, parallel, glowing gas-filled tubes in a variety of colors form block letters to spell out the name of a nightclub. Adjacent tubes are all 2.80 cm apart. The tubes forming one letter are filled with neon and radiate predominantly red light with a wavelength of 640 nm. For another letter, the tubes emit predominantly blue light at 440 nm. The pupil of a dark-adapted viewers eye is 5.20 mm in diameter. (a) Which color is easier to resolve? State how you decide. (b) If she is in a certain range of distances away, the viewer can resolve the separate tubes of one color but not the other. The viewers distance must be in what range for her to resolve the tubes of only one of these two colors?arrow_forwardThe Area A1 is 3.14 m2, The Lamp #1 has a Luminous flux 400 lumens, and the Distance D1 is 4 meters. What is the illuminance on the A1 (the Lamp#2 is off)arrow_forward
- Astronomers want to observes celestial objects in the electromagnetic spectrum when the atmosphere is opaque . what options do they have?arrow_forward1. A star in a distant galaxy approaches the Sun at 3 X 106 m/s. It emits a photon with a wavelength of 0.4 microns. Apply the Doppler Effect to estimate the observed wavelength of this photon. 2. An object is 2 meters from a thin lens with a focal length of 50 cm. Apply the thin-lens equation to calculate the image distance from the lens and magnification.arrow_forwardThe Sun appears to be red as it sets because:1. Air absorbs red light less than other frequencies (i.e., acts like a red filter).2. The sunlight has a red shift when you're moving fastest away from it.3. The Sun cools down to 5000 K each evening.4. Light is refracted as it enters the atmosphere.5. The Sun dies in a glorious fireball each evening and is reborn each morning.6. None of the above.arrow_forward
- Which wave would represent light on the red end of the visible light spectrum and why? A) wave a, lowest amplttidue B) wave b, lowest frequency C) wave c, lowest frequency D) wave d, lowest amplitudearrow_forwardIf you were to observe the sunset on the Moon, would you see the space around the sun as red, like you do on earth? Yes, because the color of light is independent of where you are. No, you would see it blue because of scattering of light. It would depend on the time of the day when you look at the sky. You would not because there is no atmosphere on the moon to scatter the light. You would not because the moon absorbs all the colors of light. You would see it black because the moon reflects all the colors. Yes, you would see it red like on the earth because both the moon and the earth are spehrical.arrow_forwardWhich object is hotter? Object 1 at T = 30° Object 2 at T = 30° Object 3 at T = 30arrow_forward
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