Which type of mechanical wave needs a source of energy to produce it?

a. a transverse wave

b. a longitudinal wave

c. a surface wave

d. all of the above

Given the frequency of an electromagnetic wave, what else can you find immediately?

When light rays reflect off a rough surface, they ... ?

What is the force between a 3 Coulomb charge and a 2 Coulomb charge separated by a distance of 5 meters?

Marine magnetic anomalies result from seafloor spreading in conjunction with

Evidence that supported the hypothesis of continental drift included fossils, land features and ___. A: ocean currents B:solar activity C:climate data D:presence of bacteria

At distances greater than 2 femtometers, the nuclear strong force is stronger than (select all that apply): gravity electromagnetic forces nuclear weak force none of the above

Identifying the Functions of Parts of the Ear Which part of the ear changes sound to a signal that the brain can understand? Which part of the ear carries the signal to the brain?

Which tool would a scientist use to find the mass of an object?

Who are the launched dog on moon A. mark B. lyca C. mcmc D. seul

The excerpt is from an article that Roberto read for science class called "Using the Scientific Method to Study Tomatoes." The student performed an experiment to test his hypothesis about sunlight and plant height using two plants.