The hydrogen balmer line hβ has a wavelength of 486.1 nm in the laboratory. it is observed in a quasar at 2430.5 nm. what is the change in wavelength (in nm) of this quasar? is it a "redshift" or "blueshift"?

a. 0; no change
b. 2430.5; redshift
c. 486.1; blue shift
d. 1944.4; blueshift
e. 1944.4; redshift

e. 1944.4; redshift

Explanation:

The hydrogen Balmer line Hβ has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar? Is it a "redshift" or "blueshift"?

a. 0; no change

b. 2430.5; redshift

c. 486.1; blue shift

d. 1944.4; blueshift

e. 1944.4; redshift

Solution

wavelength is the distance between two successive crest or the difference between two successive trough.

it is also the ratio between velocity and frequency

difference in wavelength=

2430.5 nm-486.1 nm=

1944.4; redshift

When an object moves away from us, the light is tilted to the red end of the spectrum(combination of seven colours), as its wavelengths get longer

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