Question

Please help me answering this question (science ncert class 8) ​

Answer 1

Answer:

1. False.

2. True

3.False

4.

5.True

Explanation:

1.  Sound between 20 Hz to 200 Hz is audible to u

2.To and fro motion is oscillatory motion. When an object has movement in the forwarding direction as well as equal movement in a backward direction following the fixed path with the state of rest or equilibrium in between, it is termed to have Oscillatory motion.

3.Sound waves travel faster and more effectively in liquids than in air and travel even more effectively in solids.

4.In the world around us, large heavy objects tend to vibrate more slowly than small lighter objects, so it's no surprise that a large diameter drum gives us a low frequency sound, and a small diameter drum generally has a higher frequency.

5.lants, such as hollies and junipers, that have thick branches at ground level provide excellent noise reduction. Additionally, a solid wall is more effective at blocking noise than plants.