The star Rigel, blinks in a blue color, whose approximate wavelength is 400 nm and the...
The star Rigel, blinks in a blue color, whose approximate wavelength is 400 nm and the star Betelgeuse, has a reddish color, whose approximate wavelength is 700 nm. a) Estimate the surface temperature of Rigel in Kelvin. b) Estimate the Betelgeuse surface temperature in Kelvin degrees c) How many times is one of the stars cooler than the other? Which is colder?
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The star Rigel, blinks in a blue color, whose approximate wavelength is 400 nm and the...
Question 16 (1 point) Visible light has wavelengths ranging between approximately 4000 and 7000 Angstroms (400...
Question 16 (1 point) Visible light has wavelengths ranging between approximately 4000 and 7000 Angstroms (400 to 700 nanometres). Which of the following statements is true regarding the surface temperature of a star for which the wavelength of maximum intensity falls in the visible range t could never be cooler than 8000 K It must always be cooler than 5500 K t must lie between 8000 K and 5500 K It must always be hotter than 3500 K Question 17...
6 1. A red photon has a wavelength of 660 nm. How fast must a star...
6
1. A red photon has a wavelength of 660 nm. How fast must a star be moving toward the Earth for a red photon emitted by the star to change its color to an orange photon of wavelength 620 nm? You may, if you wish, express your answer either in m/s or in terms of the speed of light c (e.g., "0.021c"). [You'll need to do a little bit of algebra. Keep in mind that, by convention, the velocity...
3. A strange hypothetical atom has only 5 energy levels that its electrons can occupy (instead of...
Cosmology
6
3. A strange hypothetical atom has only 5 energy levels that its electrons can occupy (instead of an infinite number). Determine how many spectral lines will appear in its spectrum. Show how you arrive at your answer by drawing a sketch similar to Figure 7-4 (but with no energy levels beyond n-5). [Hint: electrons can "jump" from any level onto any other level.] [4 points; from Chapter 7] 4. A strange star with a surface temperature of 5,000...
Exercise 5: I was changing 34 around too much that I just made it a separate...
Exercise 5: I was changing 34 around too much that I just made it a separate exercise. Suppose 310. grams of ethanol (ethyl alcohol) is in an aluminum cup of 90.0 grams. Both of these are at 30.0C. A mass m of ice at - 8.5C is taken from a freezer and added to the alcohol in the cup. The final temperature of all the components is 18.0C. Assuming no heat was lost from the system, calculate the mass m...
Question 16 (1 point) Visible light has wavelengths ranging between approximately 4000 and 7000 Angstroms (400 to 700 nanometres). Which of the following statements is true regarding the surface temperature of a star for which the wavelength of maximum intensity falls in the visible range t could never be cooler than 8000 K It must always be cooler than 5500 K t must lie between 8000 K and 5500 K It must always be hotter than 3500 K Question 17...
6
1. A red photon has a wavelength of 660 nm. How fast must a star be moving toward the Earth for a red photon emitted by the star to change its color to an orange photon of wavelength 620 nm? You may, if you wish, express your answer either in m/s or in terms of the speed of light c (e.g., "0.021c"). [You'll need to do a little bit of algebra. Keep in mind that, by convention, the velocity...
Cosmology
6
3. A strange hypothetical atom has only 5 energy levels that its electrons can occupy (instead of an infinite number). Determine how many spectral lines will appear in its spectrum. Show how you arrive at your answer by drawing a sketch similar to Figure 7-4 (but with no energy levels beyond n-5). [Hint: electrons can "jump" from any level onto any other level.] [4 points; from Chapter 7] 4. A strange star with a surface temperature of 5,000...
Exercise 5: I was changing 34 around too much that I just made it a separate exercise. Suppose 310. grams of ethanol (ethyl alcohol) is in an aluminum cup of 90.0 grams. Both of these are at 30.0C. A mass m of ice at - 8.5C is taken from a freezer and added to the alcohol in the cup. The final temperature of all the components is 18.0C. Assuming no heat was lost from the system, calculate the mass m...
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