https://padlet.com/j_oh/728lpzm70g53 Observe what happened to the pitch and why the pitch changes. en-us 2017-08-27 10:24:28 UTC 2017-09-02 04:49:26 UTC hello@padlet.com j_oh https://padlet.com/j_oh/728lpzm70g53/wish/183262111 I think filling the cup with water to the top will make high pitch.]]> 2017-08-28 23:08:38 UTC https://padlet.com/j_oh/728lpzm70g53/wish/183262111 j_oh https://padlet.com/j_oh/728lpzm70g53/wish/183262199 I think the one with no water make high pitch.]]> 2017-08-28 23:09:24 UTC https://padlet.com/j_oh/728lpzm70g53/wish/183262199 j_oh https://padlet.com/j_oh/728lpzm70g53/wish/183262236 I think the one with no water will make a low sound.]]> 2017-08-28 23:09:42 UTC https://padlet.com/j_oh/728lpzm70g53/wish/183262236 j_oh https://padlet.com/j_oh/728lpzm70g53/wish/183264292 I learnt that tapping the cup makes high and low sounds (pitch).]]> 2017-08-28 23:28:08 UTC https://padlet.com/j_oh/728lpzm70g53/wish/183264292 j_oh https://padlet.com/j_oh/728lpzm70g53/wish/183264544 I learnt that the cup with lots of water makes low pitch.]]> 2017-08-28 23:30:11 UTC https://padlet.com/j_oh/728lpzm70g53/wish/183264544 j_oh https://padlet.com/j_oh/728lpzm70g53/wish/183264721 I learnt about high and low sounds. No water makes low sounds/pitch and lots of water make high pitch.]]> 2017-08-28 23:31:34 UTC https://padlet.com/j_oh/728lpzm70g53/wish/183264721 j_oh https://padlet.com/j_oh/728lpzm70g53/wish/183264884 I think the cup with no water would make high sounds.]]> 2017-08-28 23:33:08 UTC https://padlet.com/j_oh/728lpzm70g53/wish/183264884