Anumber written in scientific notation has the form a×10k, where 1≤a< 10 and k is an integer, that is, k is one of −3,−2,−1,0,1,2, part a determine the values of a and k when 299,790,000 is written in scientific notation. enter a and k, separated by commas.

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

Answer quickly (15 points) a comet is approaching earth. describe earth’s gravitational pull as the comet gets closer to it. a. remain constant b. increase c. decrease d. reversed

Can anybody me with this? ? (picture included.)