Part 1 Part A A radio receiver can detect signals with electric field amplitudes

Question

Part 1

Part A

A radio receiver can detect signals with electric field amplitudes as small as 350 V/m .

What is the intensity of the smallest detectable signal?

Answer is NOT 5.423E-19

Part 2

A typical helium-neon laser found in supermarket checkout scanners emits 633-nm-wavelength light in a1.0-mm-diameter beam with a power of 1.3 mW .

Part A

What is the amplitude of the oscillating electric field in the laser beam?

Answer is NOT 1.934E7 V/m

Part B

What is the amplitude of the oscillating magnetic field in the laser beam?

Answer is NOT .0645 T

Explanation / Answer

here,

amplitude of signals ,

Em = 350 *10^-6 V/m

Em = 3.50 *10^-4 V/m

the intensity of the signal = 0.5 * Em^2/( c*u0)

intensity of the signal = 0.5 * 3.50 *10^-4 ^2 /( 3 *10^8 * u0)

intensity of the signal = 1.624 *10^-10 W/m^2

the intensity of the signal is 1.624 *10^-10 W/m^2

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