Dem

1. 2. 3. 4. 5. 6. 7. 8.

How are sounds made ? We can try to make things vibrate with ……….. Which part of our body vibrates to make sounds when we talk or sing ? What are vibrating in bee to make sounds? How do sounds travel? Can sounds travel through air? Can sounds travel through liquids? Can sounds travel through solids?

Jasmine’s neighbour is drilling into the wall. Jasmine can hear the loud drilling sound from next door. 9. What is the source of the sounds? 10. How does the sound travel from next door to jasmine’s ear? 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28.

Nina is at a swimming pool. There is a music coming out from a loudspeaker beside the pool. How can maria hear the music from loudspeaker when she is out of the water? How can maria hear the music from loudspeaker when she is underwater? Why are some sounds soft and some sounds loud ? The example of soft sound and loud sound is ? What can we use to measure sound level ? Sounds level are measured in the unit …. 60-70dB is the sound levels of Which sound can give we pain in ears ? What is the sound level of the rustling leaves? Which has a higher sound level, the sound in the library or people talking ? We should protect our ears by …………. Very loud sounds can damage our ears and make us ………… Loud sounds have sound level above ……… dB A soft sound has a ……… volume and ……… A loud sound has a low volume and sound level (T/F) Unwanted sounds are called …….. Example of ear defender is ………………… and ……………. Closing doors and windows are some way to keep out noise, the other way is….

29. A high-pitched sound is made when a thing or material ………………………… such as 30. A low-pitched sound is made when a thing or material ………………………… such as 31. Boys pitched voice will become lower when they were grow up (T/F) 32. Pitch is same with loudness or volume (T/F) 33. String instruments make sounds when …………….. 34. A drum make a higher pitched sound when it has a ……………….. drum skin.