An astronomer observes a faint object with a ground telescope. A selected ultraviolet wavelength is completely absorbed by the atmosphere above the telescope. Which change would allow this ultraviolet radiation to be detected?
Increase the mirror area and keep the telescope at the same site.
Increase the exposure time and keep the telescope at the same site.
Place a suitable detector and telescope outside the atmosphere.
Replace the detector with photographic film at the same site.
75 exam-style questions on Edexcel GCSE Physics 7.3 Stars, covering 7.3.1 Evolution of stars similar to the Sun, 7.3.2 Evolution of massive stars, and 7.3.3 Observing the Universe. Each one has a worked solution and a mark scheme showing where the marks go.