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Science Exercise 12

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

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