What is the apparent change in frequency of waves due to the motion of a
source? (2 points)
O Photoelectric effect
O Prismatic change
O Doppler effect
Wavelength variabilita

Astudent looks at ocean waves coming into the beach. an ocean wave with more energy will a) have a greater height. b) have a greater period. c) travel toward the beach faster. d) strike the beach with greater frequency.

Herbivores, carnivores, and omnivores are all types a. decomposers b. producers c. consumers d. biomes

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?