help please i need all parts answered

3. For the following questions, you may use any resources you wish to answer them. You must write your solutions by hand, cite all your references, and show all your calculations. [a] Watch the Crash Course Physics #39 video at youtube.com/watch?v=IRBfpBPELmE (Light is Waves). Write down and describe at least three concepts or ideas about light waves that you found interesting in the video, and give the time stamps when they are first mentioned - at least one between 0:01 and 3:30 of the video, at least one between 3:31 and 7:00, and at least one between 7:01 and the end of the video. Your answer should total about 30-50 words. [b] Watch the Crash Course Astronomy #24 video at youtube.com/watch?v-jjy-eqWM38g (Light). Do the same with this video as you did with the video in part [a] above. [c] Watch the Physics Girl video youtube.com/watch?v=3BRP4wcSCMO (Why aren't plants black?) Do the same with this video as you did with the video in part [a] above, except you can choose time stamps at any three places in the video rather than having to choose zones of time. [d] A wave has a velocity of X meters per second and a frequency of W per second. What is its wavelength? Show your calculations