The H α transition in hydrogen has a rest wavelength of 656.3 nm, coming from electrons...
The H α transition in hydrogen has a rest wavelength of 656.3 nm, coming from electrons moving between the n=2 and n=3 orbitals. You observe a star in which this transition shows a wavelength of 650 nm. How fast is the star moving? Is it moving toward you or away from you. Calculate the same for a galaxy where the wavelength of H α is 1100 nm.
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The H α transition in hydrogen has a rest wavelength of 656.3
nm, coming from electrons...
(a) At what wavelength will we observe a spectral line emitted at 500 nm by a...
(a) At what wavelength will we observe a spectral line emitted at 500 nm by a star (b) At what wavelength will we observe the Ca II line (with rest wavelength 397.0 (c) A cloud of neutral hydrogen (HI) emits the so-called "21-cm line" (actually moving toward us at 100 km/s? nm) emitted by a galaxy receding at 60,000 km/s? 21.11 cm, at rest frequency 1420.2 MHz) while moving away at 200 km/s. At what frequency will we observe this...
One of the visible lines of hydrogen has a rest wavelength of 656.285 nm, but it...
One of the visible lines of hydrogen has a rest wavelength of 656.285 nm, but it appears in the spectrum of the star Vega at 656.255 nm. How is Vega moving relative to us( toward or away)? Calculate with what speed. Show work.
You obtain spectra for two galaxies and measure the observed wavelength of a hydrogen emission line...
You obtain spectra for two galaxies and measure the observed wavelength of a hydrogen emission line that has a rest wavelength of 656.3 nm. Here are your results: Galaxy 1: Observed wavelength of hydrogen line is 672.9 nm Galaxy 2: Observed wavelength of hydrogen line is 692.6 nm (a) Calculate the redshift, z, for each of the two galaxies. (b) What is each one’s recessional velocity (in km/s)? (c) Which of these galaxies is farther away from you? (d) How...
DopplerShift:TheHb(hydrogenbeta)line,whichisstronginthespectraof moderately hot stars, has a wavelength of 486.133 nm in the laboratory (i.e., at rest...
DopplerShift:TheHb(hydrogenbeta)line,whichisstronginthespectraof moderately hot stars, has a wavelength of 486.133 nm in the laboratory (i.e., at rest with respect to the observer). What wavelength (nm) would we observe the Hb line on Earth if it were emitted by a star: a) moving at a speed of 200 km/s toward Earth? b) moving at a speed of 300 km/s away from Earth?
A red emission lone from a star has a wavelength of 650 nm. A) What is...
A red emission lone from a star has a wavelength of
650 nm.
A) What is the corresponding frequency?
B How much energy does each photon at this wavelength
carry?
Back HW 2.pdf SCIE 223: Astronomy Written Homework 2 due Thursday, November 21, 2019 A red emission line from a star has a wavelength of 650 nm. 1) What is the corresponding frequency? Show your work a. b. How much energy does each photon at this wavelength carry? Show your...
1. (A) Find the de Broglie wavelength (in nm) associated with an electron that is moving...
1. (A) Find the de Broglie wavelength (in nm) associated with an electron that is moving with a velocity of 2310 km/s. The electron rest mass is 9.11 x 10-31 kg. Note, electrons having this speed would need to be treated as waves in atoms because the wavelength is on the order of the size of atoms. (B) A baseball weighs 220 g. Top speed for a professional pitcher is about 100 mph when he throws a fast ball. Find...
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...
11. Astronomers observing a distant galaxy detect light from the Lyman a transition (n = 2 → n = 1 in hydrogen) at a fr...
11. Astronomers observing a distant galaxy detect light from the Lyman a transition (n = 2 → n = 1 in hydrogen) at a frequency of 2.25 x 1015 Hz. Estimate how far away the galaxy is. (You may take the Hubble constant to be 70kms- Mpc) A supernova causes a sudden brightening of the galaxy, which lasts for forty days as seen from Earth. How long did it last in the rest-frame of the galaxy?
11. Astronomers observing a...
Calculate the energy and the wavelength of the electron transition from n =1 to n = 4 in the hydrogen atom. J nm
Calculate the energy and the wavelength of the electron transition from n =1 to n = 4 in the hydrogen atom. J nm
A transition in the Balmer series for hydrogen has an observed wavelength of 434 nm. Use...
A transition in the Balmer series for hydrogen has an observed wavelength of 434 nm. Use the Rydberg equation below to find the energy level that transition originated. Transitions in the Balmer series all terminate in n = 2. deltaE = -2.178 times 10^-18 J|1/n^2_final - 1/n^2_initial|
(a) At what wavelength will we observe a spectral line emitted at 500 nm by a star (b) At what wavelength will we observe the Ca II line (with rest wavelength 397.0 (c) A cloud of neutral hydrogen (HI) emits the so-called "21-cm line" (actually moving toward us at 100 km/s? nm) emitted by a galaxy receding at 60,000 km/s? 21.11 cm, at rest frequency 1420.2 MHz) while moving away at 200 km/s. At what frequency will we observe this...
A red emission lone from a star has a wavelength of
650 nm.
A) What is the corresponding frequency?
B How much energy does each photon at this wavelength
carry?
Back HW 2.pdf SCIE 223: Astronomy Written Homework 2 due Thursday, November 21, 2019 A red emission line from a star has a wavelength of 650 nm. 1) What is the corresponding frequency? Show your work a. b. How much energy does each photon at this wavelength carry? Show your...
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...
11. Astronomers observing a distant galaxy detect light from the Lyman a transition (n = 2 → n = 1 in hydrogen) at a frequency of 2.25 x 1015 Hz. Estimate how far away the galaxy is. (You may take the Hubble constant to be 70kms- Mpc) A supernova causes a sudden brightening of the galaxy, which lasts for forty days as seen from Earth. How long did it last in the rest-frame of the galaxy?
11. Astronomers observing a...
Calculate the energy and the wavelength of the electron transition from n =1 to n = 4 in the hydrogen atom. J nm
A transition in the Balmer series for hydrogen has an observed wavelength of 434 nm. Use the Rydberg equation below to find the energy level that transition originated. Transitions in the Balmer series all terminate in n = 2. deltaE = -2.178 times 10^-18 J|1/n^2_final - 1/n^2_initial|
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