1.a wave has a period of 20 seconds. what is the frequency?

2.in 4 seconds 3 waves pass a point. what is the frequency? what is the period?

3.what is the speed of a wave that has a frequency of 2hz, an amplitude of 10m, and a wave length of 5m?

What happens to the light rays when they hit the specimen?

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?