Year 11 GCSE (Higher) SPACE FOR REFLECTION OCR Gateway Science Suite Lessons 9-10 (P5e) 1) Explain that microwaves are sent as a thin beam because they diffract very little due to their short wavelength 2) Describe how diffraction depends on the size of the gap of obstacle 3) Describe that long wavelength radios waves carry signals by amplitude modulation (AM)
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