• Amplitude i.e the height of the wave.
• Wavelength i.e the distance between the two crest.
• Period i.e time taken by the one complete wave which will measure in second.

Wave is a disturbance that travel through a medium from one point in space to another.

Crest, Trough, Amplitudes and Wavelength are all aits priperties.

Students can get complete information on waves and its types and all its characteristics with examples below for reference. 

https://byjus.com/physics/waves/&ved=2ahUKEwjVwr20tPndAhVKpo8KHceVBisQFjAOegQIBRAB&usg=AOvVaw0JjxNz5ec4ElGzwHR-QBZP&cshid=1539089942359

Hi

To get an answer for such questions, I will suggest you to refer to some good books for JEE Main preparation.

Refer to the links below for same:

https://engineering.careers360.com/articles/best-books-for-jee-main-2019

https://engineering.careers360.com/articles/jee-main-important-topics-books

https://engineering.careers360.com/download/jee-main-ebooks

All the best!