### Red Shift Calculator:

Redshift is an important concept for astronomers. This is defined as the wavelength of light being stretched and then seen shifted towards the red part of the spectrum. In physics, redshift is an increase in wavelength or frequency of electromagnetic radiation and a decrease in photon energy.

The causes of the redshift are the relativistic Doppler effect, the gravitational effect and the expansion of the universe. The redshift calculator helps you estimate the redshift parameter z. The discovery of redshift in astrophysics has become a critical point in understanding the history of our universe. Finally, we also discuss the differences between redshift and blueshift.

Redshift is a phenomenon in which the spectral lines of electromagnetic radiation from certain stars or galaxies are shifted toward longer wavelengths or lower frequencies. The term redshift was introduced because visible light of longer wavelengths is red (approximately 700 nm). Several reasons can cause a red shift:

Gravitational effect – light “passes” the star’s gravitational pull and loses energy, i.e., the light has its wavelength increased.

See the following sections for simple steps to calculate the redshift parameter.

- Get the wavelength of light emitted and get the wavelength of light observed.
- Subtract the emitted ligar wavelength from the observed light wavelength.
- To check the redshift parameter, divide the result by the wavelength of the emitted light.

### Redshift Formula:

Redshift formula is the redshift parameters z is equal to the wavelength and frequency of the observed light λ_{0(nm)} in nanometer and minus the wavelength and frequency of emitted light λ_{e} _{(nm)} in nanometer and divided by the wavelength and frequency of emitted light λ_{e(nm)} in nanometer is equal to the the wavelength and frequency of emitted light fe and minus the wavelength and frequency of the observed light fo and divided by the wavelength and frequency of the observed light f0. Hence the Redshift formula can be written as

Z = (λ_{0(nm)} –λ_{e} _{(nm)}) /λ_{e(nm)} = (fe – fo ) / f0

Where

Z = is the redshift parameters

λ_{e}, fe are the wavelength and frequency of emitted light

λ_{}, f0 is the wavelength and frequency of the observed light

### Example:1

IF the emitted and observed light wavelength are 200nm. 150nm, find the redshift parameters?

### Answer:

Given that

Emitted light wavelength λ_{e} =200nm

Observed light wavelength λ_{o} =150nm

Emitted light frequency fe = c / λ_{e}

=299,792,458 /200

=1498962

The observed light frequency fo = c / λ_{e}

=299,762,458 /150

=1998416

Redshift parameters z =(fe –fo ) /fo

=(1498962 -1998416 )/ 1998416

=-0.24

Therefore, the redshift parameters is -0.24

### Example:2

IF the emitted and observed light wavelength are 500nm. 450nm, find the redshift parameters?

### Answer:

Given that

Emitted light wavelength λ_{e} =500nm

Observed light wavelength λ_{o} =450nm

Emitted light frequency fe = c / λ_{e}

=299,792,458 /500

=599584

The observed light frequency fo = c / λ_{e}

=299,762,458 /450

=666138

Redshift parameters z =(fe –fo ) /fo

=(599584-666138 )/ 666138

=0.09991022881

Therefore, the redshift parameters is -0.09