An electromagnetic wave is a mechanical wave. true or false

Answer is false.

An electromagnetic wave is a non-mechanical wave which does not require a medium for its transmission. This travels even through vacuum. Examples of electromagnetic waves are radio wave, X ray, infra red rays,gamma rays etc.

A mechanical wave requires a medium for transmission. There are three types of mechanical waves namely transverse waves, longitudinal waves and surface waves. Some of the examples of mechanical waves are sound waves,water waves and seismic waves.

1/0.14nm = 10^10/1.4 a lot

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day