Project Seafarer was an ambitious program to construct anenormous antenna, buried underground on a site about 10000km2 in area. Its purpose was to transmit signals tosubmarines while they were deeply submerged. Ordinarily,electromagnetic radiations do not penetrate very far intoconductors such as seawater. Assume that the effective wavelengthwas 1.3 104 Earth radii.
(a) What would be the frequency of the radiationsemitted?
Hz
(b) What would be the period of the radiations emitted?
s