As waves move through water, the water at any point rises and falls. At a given moment, two points along the wave’s line of travel that are 2 meters apart have each risen to form adjacent crests. Which measure is described by this observation? frequency

wavelength

speed

amplitude

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?