Question

In: Physics

Emission lines from the hydrogen Hβ line (rest wavelength of 486.1 nm) are observed in the...

Emission lines from the hydrogen Hβ line (rest wavelength of 486.1 nm) are observed in the spectrum of a spiral galaxy at redshift z = 0.9. The galaxy's disk is observed to be inclined at an angle of 45 degrees to the line of sight. The central wavelength of the line is observed to be shifted by 0.5 nm to the red on one side of the galaxy, and by 0.5 nm to the blue on the other side of the galaxy. What is the rotation speed of the galaxy? Hint: you must also account that the redshift expands wavelength differences (Δλmeasured = (1+z)Δλemitted)

Solutions

Expert Solution

given the

Emission lines from the hydrogen H line

rest wavelength = 486.1 nm

The spectrum of spiral galaxy at redshift z = 0.9


Related Solutions

One of the emission lines of the hydrogen atom has a wavelength of 93.07 nm. In...
One of the emission lines of the hydrogen atom has a wavelength of 93.07 nm. In what region of the electromagnetic spectrum is this emission found? Determine the initial value of n associated with this emission.
In a hydrogen atom what is the wavelength in nm of the emission line corresponding to...
In a hydrogen atom what is the wavelength in nm of the emission line corresponding to the transition from n=4 to 3
Which spectral lines in the emission spectrum of hydrogen atoms can be observed if the atoms...
Which spectral lines in the emission spectrum of hydrogen atoms can be observed if the atoms are excited by electrons with kinetic energy E_kin = 13.3eV?
Atomic hydrogen exhibits a series of emission spectral lines that includes the following wavelengths: 1875 nm,...
Atomic hydrogen exhibits a series of emission spectral lines that includes the following wavelengths: 1875 nm, 1282 nm, and 1094 nm. (a) What is the name of the series of emission spectral lines? (b) What is the wavelength of the next line in the series?
a gas discharge lamp with prominent emission lines at 245nm, 436 nm and 546 nm is...
a gas discharge lamp with prominent emission lines at 245nm, 436 nm and 546 nm is used to illuminate a sample of iron (wavefunction 4.5 eV). Determine the allowed energies for emitted photoelctrons
The emission wavelength lies between 275 nm and 450 nm and the light yield per neutron...
The emission wavelength lies between 275 nm and 450 nm and the light yield per neutron is reported to be 20000 photons/MeV neutron energy (a) What largest work function of a material used for a photo cathode would be acceptable that still allows detection of an emission originating from the scintillator? (b) What is the maximum kinetic energy of electrons emitted from the photo cathode, given the emission wavelength range of the scintillator? (c) How much charge is being generated...
In Lyman series, one wavelength in the ultraviolet part of the hydrogen emission spectrum has wavelength...
In Lyman series, one wavelength in the ultraviolet part of the hydrogen emission spectrum has wavelength 97.2 nm. a) What is the initial state of the transition that results in this wavelength being emitted? b) What is the radius of the orbit for the initial state of the atom? c) What is the energy of the initial and final state? d) What would be the velocity of an electron of hydrogen atom in an orbit for n = 3 according...
An X-ray photon with a wavelength of 0.120 nm scatters from a free electron at rest....
An X-ray photon with a wavelength of 0.120 nm scatters from a free electron at rest. The scattered photon moves at an angle of 105° relative to its incident direction. (a) Find the initial momentum of the photon. kg·m/s (b) Find the final momentum of the photon. kg·m/s
The hydrogen atom has an emission at 1875 nm. What transition is responsible for this spectral...
The hydrogen atom has an emission at 1875 nm. What transition is responsible for this spectral line? What region of the electromagnetic spectrum would it appear? (7 pts)
Explain why you are constructing a graph for krypton emission lines but not for hydrogen.
Explain why you are constructing a graph for krypton emission lines but not for hydrogen.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT