The greek letter (delta) indicates a(n)

The differences between  a compression wave and a transverse wave?

The de broglie relation λ=h/p can be rewritten in terms of the wave number k as p=kℏ. recall that wave number is defined by k=2π/λ. using the fact that λ=v/f, find the wave numbers k1 and k2 corresponding to frequencies f1 and f2. express your answer as two expressions

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.