A broadcasting station produces radio waves of wavelength 800 m. Determine their frequency (speed of air is 3 x 108 ms⁻¹)

Tunajua kasi ya wimbi ($v$), urefu wa wimbi ($\lambda$), na tunahitaji kupata marudio ($f$).
Kasi ya wimbi, $v = 3 \times 10^8 \, \text{m/s}$
Urefu wa wimbi, $\lambda = 800 \, \text{m}$
Fomula inayohusisha hizi ni: $v = f \lambda$

Marudio yanaweza pia kuandikwa kama kilohertz (kHz) au megahertz (MHz).
$375,000 \, \text{Hz} = 375 \, \text{kHz}$
$375,000 \, \text{Hz} = 0.375 \, \text{MHz}$

Marudio ya mawimbi ya redio ni $\text{375,000 Hz}$.