Author Question: Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the ... (Read 103 times)

casperchen82 · **on:** Jul 27, 2018

Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy A. According to Hubble's law, what can you say about their approximate relative distances?

A) Galaxy A is twice as far as Galaxy B.
B) Galaxy B is four times as far as Galaxy A.
C) Galaxy A is four times as far as Galaxy B.
D) Galaxy B is twice as far as Galaxy A.
E) Not enough information to sayyou need to know Hubble's constant to answer this question.

Question 2

Which of the following is considered by biologists to be a likely place where life first arose on Earth?

A) on meteorites that landed on Earth
B) on land surfaces that got moderately heavy rainfall
C) in hot water near undersea volcanoes
D) deep underground