Which is true about mechanical waves

A. It must travel in empty space

B. Both sound and light are examples.

C. It must have a medium

D. It can travel in a vacuum.

What will happen to the density of a substance if it contracts when it freezes? 1. density will decrease 2. density will increase 3. density will remain the same 4. change in density cannot be predicted

What is the momentum of a 37-kg person riding south on an 18-kg bicycle at 1.2 m/s?

How many grams of fluorine are required to produce 10.0 g of XeF6?

When light enters a pair of glasses, it what when it hits the glass

Which type of reproduction involves both parents? Asexual Fission Mitosis Sexual

What factors allowed the koala population to grow beyond what their habitat could sustain?

What are the subscripts for the molecular formula of C2H3

What does the dashes line represent? A. Medium B. Boundary C. Normal D. Incident Ray

Only a small amount of cerium oxide nanoparticles is needed because the nanoparticles ... 1) are elements 2) are very reactive 3) have a high surface area to volume ration

Describe the solubility of water compared to ethanol?