Which wave property determines:
- loudness.
- Pitch.
Which wave property determines:
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Represent graphically by two separate diagrams:
Two sound waves having different amplitudes and also different wavelengths.
Name the two acids that are present in acid rain.
If any explosion takes place at the bottom of a lake, what type of shock waves in water will take place?

During class, the students resemble molecules in a solid (because they are very close to one another)

While going from one classroom to another the students resemble molecules in a liquid (because they are a little more father apart from one another)
Name two measures which prevent the soil erosion.
Name the sex organs of gymnosperms and angiosperms.