When a wave propgates it carries energy.......
it is energy
A wavelength carry energy. Strictly speaking, a wave carries energy. A wavelength is a property of a wave.
yes
yes
A wave needs energy to travel.
Any wave does that.
mechanical waves carry mechanical energy and electromagnetic waves carry electromagnetic energy.
No, they do not. A wave transfers energy but the matter does not move forward with the wave.
No. The energy of the wave moves thru the molecules that carry it.
Yes,.
The details vary, depending on the type of wave. But one thing a wave will always carry with it is energy.