Register
At what wavelength would its Lyα line be received by a detector above Earth's atmosphere? Express your answer using four significant figures.
167k views
0 votes
At what wavelength would its Lyα line be received by a detector above Earth's atmosphere?

Express your answer using four significant figures.

User Aditya Srivastava
by
7.2k points

1 Answer

1 vote
A distant galaxy is receding from Earth with a radial velocity of 7000 km/s .
The Lyα line has a wavelength of 121.6 nm. Using the Doppler Effect formula:
λ_obs = (121.6 nm) x (1 + (7000 km/s) / (300000 km/s)) = 124.4 nm
User Stephen Kuo
by
7.6k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

8.6m questions

11.2m answers

Other Questions

Several United States Presidents committed military troops to serve in Vietnam in an effort to a. react to violations of United States neutrality. b. support the policy of containment. c. oppose the Chinese
If a nail reacts with oxygen is it a physical property or chemical
What research Is currently being done on moon rocks?
I need help really quickly can someone help me with the truth table
Which best describes the topics covered by nonfiction works? a. facts and real events b. historical people and events c. ideas that try to influence readers d. events that never occurred
Link Copied!