Question

What frequency of an electromagnetic wave having a wavelenght of 300,000km?

Answer 1

`\huge \bf༆ Answer ༄`

As we know the relationship between frequency, wavelength and wave speed , we can infer that : -

`\sf \: f = ( v)/(λ)`

Terms in the formula

• f = frequency

• v = wave speed = 3 × 10⁸ m/s

[ v of all electromagnetic waves is 3 × 10⁸ m/s]

• λ = wavelength = 3 × 10⁵ km

• λ = 3 × 10⁵ × 10³ m

• λ = 3 × 10⁸ m

Time to find the frequency : -

• 
  `\sf \: f = \frac{3 * 10 {}^(8) }{3 * 10 {}^(8) }`

• 
  `\sf \: f = 1 \: sec {}^( - 1) or \: hertz`

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