If a wave has a wavelength of 4.5 meters and a period of 0.007 second, what’s the velocity of the wave?

v = fλ

v = velocity, f = frequency, λ = wavelength

f = 1/T

f = frequency, T = period

v = fλ = λ/T

Given values:

λ = 4.5m, T = 0.007s

v = 4.5/0.007

v = 643m/s

Round to 2 significant figures:

v = 640m/s

v = I ⁄ T  

v= 4.5  ⁄ 0.007  

v = 642.9 m/s

Explanation:

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.