In which of the following situations is the Doppler Effect absent? The source and the observer are moving towards each other.

The observer is moving toward the source.

The source is moving away from the observer.

The source and the observer are both moving with the same velocity.

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.

What are similarities and differences of reflection, refraction, diffraction and absorption?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.