P5.2h describe how ultra-violet waves, X-rays and gamma-rays can have 100-2 85-6 102-4, 223-4 hazardous effects, notably on human bodily tissues P5.2i explain, in qualitative terms, how the differences in velocity, 100-2 85-6 102-4, 223-4 absorption and reflection between different types of waves in solids and liquids can be used both for detection and for exploration of structures which are hidden from direct observation, notably in our bodies To include the use of infra-red, X-rays, gamma and ultrasound as an alternative in medical imaging P5.2j recall that radio waves can be produced by, or can themselves 101 85 103, 223 induce, oscillations in electrical circuits P5.3 Wave interactions P5.3a recall that different substances may absorb, transmit, refract, or 100-2 85-6 102-4, 223-4 reflect electromagnetic waves in ways that vary with wavelength P5.3b explain how some effects are related to differences in the velocity of 100-2 85-6 102-4, 223-4 electromagnetic waves in different substances P5.3c use ray diagrams to illustrate reflection, refraction and the similarities 96-7 82 98-9, 220 and differences between convex and concave lenses (qualitative only) To include how the behaviour of convex and concave lenses determine how they may be used, for example, to correct vision P5.3d construct two-dimensional ray diagrams to illustrate reflection and 96-7 82 98-9, 220 refraction (qualitative only not needed) –equations P5.3e explain how colour is related to differential absorption, transmission 106-7 89-90 108-9, 227-8 and reflection To include specular reflection and scattering P6: Radioactivity P6.1 Radioactive emissions P6.1a recall that atomic nuclei are composed of both protons and neutrons, 49-50 42-3 51-2, 180-1 that the nucleus of each element has a characteristic positive charge P6.1b recall that atoms of the same elements can differ in nuclear mass by 49-50 42-3 51-2, 180-1 having different numbers of neutrons
P5.2h describe how ultra-violet waves, X-rays and gamma-rays can have hazardous effects, notably on human bodily tissues 100-2 85-6 102-4, 223-4 P5.2i explain, in qualitative terms, how the differences in velocity, absorption and reflection between different types of waves in solids and liquids can be used both for detection and for exploration of structures which are hidden from direct observation, notably in our bodies To include the use of infra-red, X-rays, gamma and ultrasound as an alternative in medical imaging 100-2 85-6 102-4, 223-4 P5.2j recall that radio waves can be produced by, or can themselves induce, oscillations in electrical circuits 101 85 103, 223 P5.3 Wave interactions P5.3a recall that different substances may absorb, transmit, refract, or reflect electromagnetic waves in ways that vary with wavelength 100-2 85-6 102-4, 223-4 P5.3b explain how some effects are related to differences in the velocity of electromagnetic waves in different substances 100-2 85-6 102-4, 223-4 P5.3c use ray diagrams to illustrate reflection, refraction and the similarities and differences between convex and concave lenses (qualitative only) To include how the behaviour of convex and concave lenses determine how they may be used, for example, to correct vision 96-7 82 98-9, 220 P5.3d construct two-dimensional ray diagrams to illustrate reflection and refraction (qualitative only –equations not needed) 96-7 82 98-9, 220 P5.3e explain how colour is related to differential absorption, transmission and reflection To include specular reflection and scattering 106-7 89-90 108-9, 227-8 P6: Radioactivity P6.1 Radioactive emissions P6.1a recall that atomic nuclei are composed of both protons and neutrons, that the nucleus of each element has a characteristic positive charge 49-50 42-3 51-2, 180-1 P6.1b recall that atoms of the same elements can differ in nuclear mass by having different numbers of neutrons 49-50 42-3 51-2, 180-1
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