Question

how could he use these materials to measure the frequency of the waves? choose 1 answer: a hold the meterstick vertically in the water. capture video of the waves from the side. scroll through the video to find the highest and lowest levels reached by water on the meterstick as waves pass. find the difference of these values and divide it by two. b hold the meterstick horizontally near the water’s surface, pointing in the direction the waves are moving. capture video of the waves from above. pause the video to find the distance between one crest and the next crest on the meterstick. c capture video of the waves from above while holding the camera still. play the video and count how many wave crests enter one side of the screen during the video. divide this number by the total time of the video.

Explanation:

Frequency of a wave is defined as the number of wave - crests (or troughs) that pass a fixed point per unit time. Option C describes the correct method of counting the number of wave - crests that enter a side of the screen in a given time and then dividing by the total time of the video to get the frequency. Option A measures the amplitude (height) of the wave, not the frequency. Option B measures the wavelength (distance between consecutive crests), not the frequency.

Answer:

C. Capture video of the waves from above while holding the camera still. Play the video and count how many wave crests enter one side of the screen during the video. Divide this number by the total time of the video.