Project seafarer was an ambitious program to construct an enormous antenna, buri

Question

Project seafarer was an ambitious program to construct an enormous antenna, buried underground on a site about 10000 km^2 in area. Its purpose was to transmit signals to submarines while they were deeply submerged. If the effective wavelength were 4.4 times 10^4 Earth radii, what would be the (a) frequency and (b) period of the radiation emitted? Ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater. Take the Earth's radius to be 6370 km. (a) Number ________ Units (b) Number _______ Unit

Explanation / Answer

a) Formula for calculating the value of the frequency(f) of the radiation is,

                      f = c / ..................(1)

Here c = speed of light = 3.0 x 108 m/s

          = 4.4 x 104 RE

Ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater. Take the Earth's radius to be 6370 km.

= (4.4 x 104)(6370 x 103)

so , f= (3 x 108)/ [(3.5x 104)(6370 x 103)] = 1.070 x 10-3 Hz

b) Now time period is, T = 1 / f

T = 934.27 s

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.