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An astronomical satellite detects two distinct narrow-band signals, $X\,$ and $Y$ , from a distant active galactic nucleus.

Signal $X\,$ has a wavelength of 2.0 × 10^-7 m.
Signal $Y\,$ has a wavelength of 8.0 × 10^-5 m.

Which row in the table correctly identifies the regions of the electromagnetic spectrum to which these signals belong, and the ratio of the photon energy of $X\,$ to the photon energy of $Y$ ( $EXEY\displaystyle \frac{E_X}{E_Y}$ )?

Region of $X$ : Ultraviolet | Region of $Y$ : Infrared | $EXEY=4.0×102\frac{E_X}{E_Y} = 4.0 \times 10^2$

Region of $X$ : X-ray | Region of $Y$ : Microwave | $EXEY=4.0×102\frac{E_X}{E_Y} = 4.0 \times 10^2$

Region of $X$ : Ultraviolet | Region of $Y$ : Infrared | $EXEY=2.5×10−3\frac{E_X}{E_Y} = 2.5 \times 10^{-3}$

Region of $X$ : X-ray | Region of $Y$ : Microwave | $EXEY=2.5×10−3\frac{E_X}{E_Y} = 2.5 \times 10^{-3}$

Electromagnetic waves Questions

Practise AQA GCSE Physics Electromagnetic waves with exam-style questions for Foundation and Higher tier. 52 questions covering Types of electromagnetic waves, Properties of electromagnetic waves 1, Properties of electromagnetic waves 2, Uses and applications of electromagnetic waves, Lenses (physics only), and Visible light (physics only), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.