An astronomical observatory detects two distinct cosmic electromagnetic signals from a distant nebula:
Signal X consists of photons each with an energy of 8.2 × 10-19 J. Signal Y has a wavelength of 2.5 cm in a vacuum.
Identify the regions of the electromagnetic spectrum to which Signal X and Signal Y belong.
Signal X: Visible light; Signal Y: Radio waves
Signal X: X-rays; Signal Y: Microwaves
Signal X: Ultraviolet; Signal Y: Microwaves
Signal X: Ultraviolet; Signal Y: Radio waves
28 exam-style questions on Edexcel IGCSE Physics The electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.