Key stage 3 Science Exercise
1. Purple colour of light has the highest _______ .
2. Red colour of light has the _______ frequency.
3. White light is a _______ of all colours.
4. All colours in white light are ________ when they hit a black object.
5. Green objects look __________ in red light.
6. Blue objects look _________ in white light because they diffusely reflected blue light.
7. Longitudinal waves are _____ waves.
8. Sound needs a _________ to travel from one place to another.
9. Sound waves can't travel in _____ .
10. Sound travels very _________ in solids.
11. Sound waves are _____ by vibrating objects.
12. Sound can be _________ and refracted.
13. Sound waves frequency is called _____ .
14. The range of frequencies are called _____ .
15. The auditory range of humans are generally _________ Hz.
16. Frequency is measured in _____ .
17. Some animals can hear _____ frequencies than humans.
Answers:1. frequency 2. lowest 3. combination 4. absorbed 5. black 6. blue 7. sound 8. medium 9. space 10. fast 11. produced 12. reflected 13. pitch 14. auditory range 15. 20-20,000 16. hertz 17. higher