Anonymous
Anonymous asked in Science & MathematicsPhysics · 2 months ago

Radio waves of very long wavelength can penetrate farther into seawater than those of shorter wavelength.....?

Attachment image

3 Answers

Relevance
  • oubaas
    Lv 7
    2 months ago

    ....the so called ELF message 

    a)

    wavelenght λ in air :

    λ = c/(n*f) = 2.998*10^8 / (1*76) = 3,944,737 m (3.94*10^6  in exponential  notation)

    b)

    wavelenght λ' in water :

    λ' = c/(n'*f) = 2.998*10^8 / (1.33*76) = 2,965,968 m (2.97*10^6 in exponential notation)

    pic below from Crimson Tide movie 

    Attachment image
  • Anonymous
    2 months ago

    the navy uses the ELF ( extreme low frequency )  to communbicate with subs deep in the ocean . 

  • NCS
    Lv 7
    2 months ago

    (a) λ = c / nf = 3e8m/s / 1.00*76Hz = 3.95e6 m

    (b) λ = 3e8m/s / 1.33*76Hz = 2.97e6 m

    near the very low end of the radio frequency range.

Still have questions? Get your answers by asking now.