A boy notices that 45 complete waves travel past him in ninety seconds. What is the frequency of these water waves

0.5 Hz

Hope you find this helpful. Please mark me as brainliest!

so easy. just google the electromagnetic waves and it’ll pop up.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.