Sound

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Across 1. Sound with frequencies greater than 20,000 Hz. 6. Sound waves can also appear as a succession of _________. 8. Loudness of the sound depend on this. 9. Sound waves can be __________ by large, hard and flat surfaces. 14. Sound is caused by this. 15. Sound needs ____________ for transmission.

Down 2. Sound waves can appear as a succession of ___________. 3. Pitch of the sound depend on this. 4. The reflected sound heard after an interval time. 5. Sound waves are _____________. 7. They only can hear sound with frequencies from 20 Hz to 20,000 Hz. 10. Sound travels faster in _______ media. 11. Sound travels faster in ________ temperature. 12. Sound cannot propagate through this. 13. The main medium to hear sound.