A. Mountain ranges linking in England and America
"Ocean waves" is the only example of mechanical waves on that list.
The other three choices are all electromagnetic waves.
Answer:
The image behind the mirror is called a virtual image because it cannot be projected onto a screen—the rays only appear to originate from a common point behind the mirror. If you walk behind the mirror, you cannot see the image, because the rays do not go there
Amplitude is a measure of the size of sound waves. It depends on the amount of energy that started the waves. Greater amplitude waves have more energy and greater intensity, so they sound louder. ... The same amount of energy is spread over a greater area, so the intensity and loudness of the sound is less.
The answer is b) false. Stars are mainly classified by their spectra (the elements they absorb) and their temperature.
