Scientists on Earth observe a star that is found to be moving at 0.510c. An emission...
Scientists on Earth observe a star that is found to be moving at 0.510c. An emission line that is known to have a rest frame frequency of 8.64 x 1014 Hz is seen. What frequency do the scientists actually see?
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Scientists on Earth observe a star that is found to be moving at
0.510c. An emission...
Electromagnetic radiation from a star is observed with an earth-based telescope. The star is moving away from the earth...
Electromagnetic radiation from a star is observed with an earth-based telescope. The star is moving away from the earth with a speed of 0.570c. If the radiation has a frequency of 8.64×1014Hz in the rest frame of the star, what is the frequency measured by an observer on earth? Express your answer with the appropriate units.
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) For a star that is moving away from the Earth, a) the spectral lines of...
1) For a star that is moving away from the Earth, a) the spectral lines of the star are much narrower than the spectral lines of an identical star that is not moving towards or away from the earth. b) the spectral lines of the star are shifted towards the blue end of the spectrum compared to an identical star that is not moving towards or away from the earth. c) the spectral lines of the star are shifted towards...
(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...
A remote star is observed from the Earth to have a shape of an ellipspod of...
A remote star is observed from the Earth to have a shape of an ellipspod of the longest axis length of 0.25 AU (parallel to x-axis), and is moving at a speed of 0.7 c relative to the Earth. The star is spherical in its rest frame. What axis could the star's velocity be parallel to? i. x-axis ii. y-axis jji. z-axis i only i and ii only ji and iii only all of the above Question 2 2 pts...
An astronomer observed electromagnetic waves emitted by oxygen atoms in a distant galaxy moving toward Earth...
An astronomer observed electromagnetic waves emitted by oxygen atoms in a distant galaxy moving toward Earth at a speed of 2.467 times 10^7 m/s. In the laboratory on Earth, oxygen atoms emit waves that have a frequency of 5.841 times 10^14 Hz. At what frequency does the astronomer observe the light emitted by oxygen atoms from the distant galaxy? A certain metal has a work function for photoelectric emission of phi delta = 3.50 eV. What is the threshold frequency...
10 trillion A distant star is traveling toward Earth with a speed of 36,500 km/s. If...
10 trillion A distant star is traveling toward Earth with a speed of 36,500 km/s. If the 1 pol star emits a light with a frequency of 5.50 x 10^14 Hz, what is the frequency of the light when it is observed on Earth. Your answer 1 point Which waves have the smaller wavelength, infrared waves or ultraviolet waves? O Infrared waves Tiltraviolet waves
Derivation of the Doppler formula and the apparent speed of a relativistic source on the sky:...
Derivation of the Doppler formula and the apparent speed of a
relativistic source on the sky: The Death star is moving towards
Earth with velocity v and at an angle q with respect to Earth’s
direction. The apparent speed of the Death star on the Sky is
Vapp=5 c. The Death star shoots with its Laser of known frequency
w’ (measured in its own rest frame). The observed frequency of the
Laser at Earth is wobs=5 w’. Calculate the Lorentz...
Practice Problem 27.3 SOLUTION A spaceship flies past earth with a speed of 0.980c (about 2.97...
Practice Problem 27.3 SOLUTION A spaceship flies past earth with a speed of 0.980c (about 2.97 x 10 m/s) relative to earth. A crew member on the spaceship measures its length, obtaining the value 400 m. What is the length measured by observers on earth? SET UP The length of the spaceship in the frame in which it is at rest (400 m) is a proper length in this frame, corresponding to lo in We want to find the length...
piloting a state-of-the-art spaceship to α Centauri, which is a star about 4 lightyears away as measured from Earth. Your ship cruises at a speed of 0.6c. For this problem, you can assume that Ea...
piloting a state-of-the-art spaceship to α Centauri, which is a star about 4 lightyears away as measured from Earth. Your ship cruises at a speed of 0.6c. For this problem, you can assume that Earth and a Centauri are at rest with respect to each other. At your journey's midpoint, you decide to send a souvenir package to your folks back home. You launcha probe back to Earth at a speed of v 0.8c from your perspective. a. How long...
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...
(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 remote star is observed from the Earth to have a shape of an ellipspod of the longest axis length of 0.25 AU (parallel to x-axis), and is moving at a speed of 0.7 c relative to the Earth. The star is spherical in its rest frame. What axis could the star's velocity be parallel to? i. x-axis ii. y-axis jji. z-axis i only i and ii only ji and iii only all of the above Question 2 2 pts...
An astronomer observed electromagnetic waves emitted by oxygen atoms in a distant galaxy moving toward Earth at a speed of 2.467 times 10^7 m/s. In the laboratory on Earth, oxygen atoms emit waves that have a frequency of 5.841 times 10^14 Hz. At what frequency does the astronomer observe the light emitted by oxygen atoms from the distant galaxy? A certain metal has a work function for photoelectric emission of phi delta = 3.50 eV. What is the threshold frequency...
10 trillion A distant star is traveling toward Earth with a speed of 36,500 km/s. If the 1 pol star emits a light with a frequency of 5.50 x 10^14 Hz, what is the frequency of the light when it is observed on Earth. Your answer 1 point Which waves have the smaller wavelength, infrared waves or ultraviolet waves? O Infrared waves Tiltraviolet waves
Derivation of the Doppler formula and the apparent speed of a
relativistic source on the sky: The Death star is moving towards
Earth with velocity v and at an angle q with respect to Earth’s
direction. The apparent speed of the Death star on the Sky is
Vapp=5 c. The Death star shoots with its Laser of known frequency
w’ (measured in its own rest frame). The observed frequency of the
Laser at Earth is wobs=5 w’. Calculate the Lorentz...
Practice Problem 27.3 SOLUTION A spaceship flies past earth with a speed of 0.980c (about 2.97 x 10 m/s) relative to earth. A crew member on the spaceship measures its length, obtaining the value 400 m. What is the length measured by observers on earth? SET UP The length of the spaceship in the frame in which it is at rest (400 m) is a proper length in this frame, corresponding to lo in We want to find the length...
piloting a state-of-the-art spaceship to α Centauri, which is a star about 4 lightyears away as measured from Earth. Your ship cruises at a speed of 0.6c. For this problem, you can assume that Earth and a Centauri are at rest with respect to each other. At your journey's midpoint, you decide to send a souvenir package to your folks back home. You launcha probe back to Earth at a speed of v 0.8c from your perspective. a. How long...
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