Question

1. Name the electromagnetic wave travelling from the satellite to the dish antenna shown in the image above.
2. If the wavelength of an electromagnetic wave is 6nm, what is its frequency?

Answer 1

i. Radio waves

ii. c = 3 × 10⁸ ms⁻¹,

1 = 6 nm = 6 × 10⁻⁹ m

∵ c = vλ

⇒ v = `c/lambda`

= `(3 xx 10^8)/(6 xx 10^-9)`

= 0.5 × 10¹⁷ Hz