The speed of light in water is 2.25 x 108 m/s. what is true about the index of refraction of water?

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap