Ijust need some with these im really struggling with these.

if a musical instrument such as a trumpet or flute is “flat”, should the pipe be lengthened or shortened? explain with at least 2 sentences.

explain how the diffraction of light shows that light behaves like a wave. use 3 sentences.

I can't help you with the first part but maybe this will help on the second part-

Light behaves as a wave - it undergoes reflection, refraction, and diffraction just like any wave would. Yet there is still more reason to believe in the wavelike nature of light. Continue with Lesson 1 to learn about more behaviors that could never be explained by a strictly particle-view of light.

Sorry couldn't do better

Explanation:

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the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.