A ground telescope and a space telescope observe the same star using identical visible-light detectors. Both record light, but the ground image is blurred. At a selected X-ray wavelength, only the space telescope records a signal. Which pair explains these observations?
Turbulence blurs the visible image; absorption prevents X-rays reaching the ground.
Absorption blurs the visible image; turbulence prevents X-rays reaching the ground.
Turbulence blurs the visible image; gravity prevents X-rays reaching the ground.
Absorption blurs the visible image; gravity prevents X-rays reaching the ground.
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.