IC2497 is a galaxy that contained a quasar - AQA - A-Level Physics - Question 4 - 2021 - Paper 4

To calculate the distance to IC2497, we can use the formula: $d = \frac{c}{H_0} \times \text{red shift}$ Where:

• $c = 3.0 \times 10^8$ m/s (speed of light)
• $H_0 = 70 \text{ km}^{-1}\text{s}^{-1} \approx 2.3 \times 10^{-18} \text{s}^{-1}$

Substituting the values:

• $d = \frac{3.0 \times 10^8 \text{ m/s}}{70 \text{ km/s}} \times 0.0516$
• $d \approx 1.5 \times 10^{10} \text{ km}$

Expressing this in megaparsecs (Mpc), we know:

• $1 \text{ Mpc} \approx 3.09 \times 10^{19} \text{ km}$

Thus, converting:

• $d \approx \frac{1.5 \times 10^{10} \text{ km}}{3.09 \times 10^{19} \text{ km/Mpc}} \approx 0.0485 \text{ Mpc}$

The distance from the Earth to IC2497 is approximately 0.0485 Mpc.