Dispersion of Light and Colours
Physics · 50 practice questions
Dispersion of white light by a triangular prism; production of a pure spectrum; colour mixing by addition and subtraction; colour of objects and colour filters; the rainbow and its formation; the electromagnetic spectrum — sources and uses of its radiation types.
- Identify primary colours and obtain secondary colours by mixing.
- Explain the formation of the rainbow and why objects have colours.
- Analyse colours using colour filters.
- Analyse the electromagnetic spectrum in relation to wavelength, sources, detection and uses.
Try a few questions
- Practice question 1
Ultraviolet radiation, having a shorter wavelength than visible light, is mainly responsible for
- A.cooking food in microwave ovens
- B.causing sunburn and is used for sterilization purposes
- C.transmitting television and radio broadcast signals
- D.producing images in a medical X-ray scan
Show the answer
B. causing sunburn and is used for sterilization purposes
UV radiation's higher energy makes it capable of both damaging skin and killing harmful micro-organisms.
- Practice question 2
A television or computer screen typically produces a wide range of colours by combining varying intensities of just three primary colours of light:
- A.red, yellow, and blue
- B.red, green, and blue
- C.cyan, magenta, and yellow
- D.black, white, and grey
Show the answer
B. red, green, and blue
These three primary colours of light, combined additively in varying intensities, can reproduce a huge range of perceived colours on a screen.
- Practice question 3
X-rays are mainly used in
- A.medical imaging, to view internal body structures such as bones
- B.ordinary household lighting
- C.long-distance radio communication
- D.remote controls for household electronics
Show the answer
A. medical imaging, to view internal body structures such as bones
X-rays' ability to penetrate soft tissue while being absorbed by bone makes them ideal for this diagnostic imaging use.
More UTME Physics topics
Practise with instant feedback
Answer questions one at a time and see the right answer and the reason straight away. Free to start.
Start practising