CAIE A-Level Physics A2 25.3.4 Hubbles L…g Theory

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Fig． 8.1 shows part of the emission spectrum of visible radiation emitted by hydrogen gas in a star in a distant galaxy．

Fig． 8.1

The galaxy is moving away from the Earth at a speed of $6.2 \times 10^{6} \mathrm{~ms}^{-1}$ ．

A value for the Hubble constant is $2.3 \times 10^{-18} \mathrm{~s}^{-1}$ .

Determine the distance of the galaxy from the Earth.
distance =
m

$v \quad=H_{0} d$ $\begin{aligned} d =\left(6.2 \times 10^{6}\right) /\left(2.3 \times 10^{-18}\right) =2.7 \times 10^{24} \mathrm{~m} \end{aligned}$

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CAIE A-Level Physics A2 25.3.4 Hubbles Law V H0d and Explain How This Leads to the Big Bang Theory Topic Practice