O-LevelPhysicsLight5054/22 · May/June 2023 · Q76 Marks

Ultraviolet radiation is one component of the electromagnetic spectrum.

(a)(i)State the name of two components of the electromagnetic spectrum that have a smaller wavelength than ultraviolet radiation. 1 2[1]
(a)(ii)State one useful application of ultraviolet radiation.[1]
(a)(iii)Exposure to ultraviolet radiation from the Sun damages the eyes. State one type of damage to the eye caused by ultraviolet radiation.[1]
(b)(i)Fig. 7.1 shows a ray of light. The ray passes into a semi-circular block of glass at A and leaves the glass at B, travelling along the surface to C. [Figure 7.1] State the name given to the angle of incidence marked as 40°.[1]
(b)(ii)Calculate the refractive index of the glass. refractive index = .................................................[2]

Mark scheme

Marking points from the official mark scheme (May/June 2023). The mark or mark type is shown in brackets.

[B1] X-rays and gamma (radiation / rays)
[B1] security marking / detecting counterfeit bank notes / sterilising water / fluorescent effects (e.g. fingerprints, blood, biological fluids) / (sun) tanning / sun beds / cancer treatment / curing inks and resins (e.g. in dental fillings) / production of vitamin (D) / generating electricity / solar panels / disinfection / sterilisation
[B1] (skin) cancer / cataracts / burns or destroys the retina or cornea
[B1] critical angle
[C1] (n =) sini/sinr or 1 / sinc
[A1] 1.6

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