An electromagnetic wave of wavelength λ \lambda\,λ approaches a gap whose width is comparable to λ\lambdaλ. As the wave passes through the gap, the wavefronts spread out.
(i) State the name of the process that occurs when waves spread out as they pass through a narrow gap or around an obstacle.
(ii) A second wave with a wavelength of λ3\displaystyle \frac{\lambda}{3}3λ approaches the same gap. Describe two ways in which the wavefront pattern beyond the gap changes compared to the original wave.
Below is a list of five different types of electromagnetic waves:
Order these waves by wavelength, writing 1 for the wave with the longest wavelength and 5 for the wave with the shortest wavelength.
(i) State the speed of electromagnetic waves in a vacuum.
(ii) A VHF radio transmitter broadcasts waves at a frequency of 120 MHz. Calculate the wavelength of these radio waves.
198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.