Answer: Here's the answer for all:
17. A Wave in a rope is a transverse: Longitudinal
18. A pebble drops straight: surface
19. In a transverse wave, : Wavelength
20. If two waves collide and for a temporary: Destructive
21. At the: Node
22. Decibel
23. C. The number of complete cycles that occur in second.
24. Electromagnetic waves are: Transverse
25. Black
26 & 27 & 28 - You should really do it by yourself its not that hard I promise you. Ill give you some simple answers so you dont get a violation.
26. The wave is most likely to go through the hole and its bending when it goes through the hole.
27. X-rays are used to make images of bones. Gamma rays are images of the brain.
28. The common thing to all the light sources listed below is artificial luminous sources.
Good luck :)
Step-by-step explanation: