Question

What is the skin depth of seawater [?r=76, ?r=1, and ?=4.1 (S/m)] at the following frequencies? a) 100 Hz b) 1.0 MHz A 250W laser transmitter positioned just under the surface of the ocean sends a signal to a super-villain's underwater lair, located 100m under the surface. Assume the transmitter is directly above the lair's antenna and there are no underwater obstructions for the EM wave. If the lair's receiver can detect signals as weak at -116 dBm, what is the highest frequency that can be used by the transmitter to send signals from the surface to the lair (the communication is not round-trip). Round your answer to the nearest 10 Hz. hint: Since the transmitter is a laser it has no spherical spreading loss (and also assume the laser is ideal). We'll revisit problems like this, with spreading loss and other real-world complications, in Chapter 9.

          What is the skin depth of seawater [?r=76, ?r=1, and ?=4.1 (S/m)] at the following frequencies?
a) 100 Hz
b) 1.0 MHz
A 250W laser transmitter positioned just under the surface of the ocean sends a signal to a
super-villain's underwater lair, located 100m under the surface. Assume the transmitter is
directly above the lair's antenna and there are no underwater obstructions for the EM wave.
If the lair's receiver can detect signals as weak at -116 dBm, what is the highest frequency that
can be used by the transmitter to send signals from the surface to the lair (the communication is
not round-trip). Round your answer to the nearest 10 Hz.
hint: Since the transmitter is a laser it has no spherical spreading loss (and also assume the laser is
ideal).
We'll revisit problems like this, with spreading loss and other real-world complications, in Chapter 9.

What is the skin depth of seawater [?r=76, ?r=1, and ?=4.1 (S/m)] at the following frequencies?
a) 100 Hz
b) 1.0 MHz
A 250W laser transmitter positioned just under the surface of the ocean sends a signal to a
super-villain's underwater lair, located 100m under the surface. Assume the transmitter is
directly above the lair's antenna and there are no underwater obstructions for the EM wave.
If the lair's receiver can detect signals as weak at -116 dBm, what is the highest frequency that
can be used by the transmitter to send signals from the surface to the lair (the communication is
not round-trip). Round your answer to the nearest 10 Hz.
hint: Since the transmitter is a laser it has no spherical spreading loss (and also assume the laser is
ideal).
We'll revisit problems like this, with spreading loss and other real-world complications, in Chapter 9.

Added by Joseph R.

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