Physics · May / June 2026 · Paper 11 · Question 40

Light is emitted from a distant galaxy with a frequency $f_e$ and a wavelength $\lambda_e$. The light from the galaxy, when observed on Earth, has a frequency $f_o$ and a wavelength $\lambda_o$. How does $f_o$ compare with $f_e$ and how does $\lambda_o$ compare with $\lambda_e$?

1. Aequal to $f_e$; greater than $\lambda_e$
2. Bequal to $f_e$; less than $\lambda_e$
3. Cless than $f_e$; greater than $\lambda_e$
4. Dless than $f_e$; less than $\lambda_e$

As printed in the paper