A database sorts records of electromagnetic radiation into the named groups of the electromagnetic spectrum. It holds one visible-light record and one infrared record, which are in neighbouring groups. A new record has a wavelength between the wavelengths of these two records.
Which statement about the new record is correct?
It belongs to neither group, because wavelengths between neighbouring groups are unclassified.
It belongs to the group of whichever existing record has the wavelength closest to its own.
It belongs to an extra unnamed group that lies between the visible-light and infrared groups.
It belongs to one of the two neighbouring groups, because the groups meet without a gap.
84 exam-style questions on Edexcel GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves and refraction in glass (core practical), 5.2.2 Groups of the electromagnetic spectrum, 5.2.3 Wavelength-dependent behaviour of EM waves, and 5.2.4 Velocities of EM waves in different substances. Each one has a worked solution and a mark scheme showing where the marks go.