If the electric field in an EM wave is in the x-direction and the magnetic field

Question

If the electric field in an EM wave is in the x-direction and the magnetic field in the wave is in the y-direction, the wave is traveling in the x-y plane. direction halfway between the x- and y-directions. z-direction. x-direction negative z-direction. Which one of the following is not an electromagnetic wave? UV infrared radio waves sound waves gamma rays The value of the electric field for a certain type of electromagnetic wave is 570 V/m. What is the value of the magnetic field for that wave? 2.91 Times 10^-6 T 1.90 Times 10^-6 T 1.10 Times 10^-6 T 1.41 Times 10^-6 T 2.41 Times 10^-6 T A cordless phone operates at 900 MHz. What is the associated wavelength? 900 m 0.25 m 300 m 3.3 m 0.33 m In an electromagnetic wave, the value of the peak field compared to the rms field is 2 time greater 2 times less times less D. squareroot 2 times greater None of the above

Explanation / Answer

1) Since in EM wave the electric field and magnetic field and direction of the motion of the wave are mutually perpendicular to each other

then the answer is C) Z-direction

2) Sound waves need a medium for it's propagation

then the answer is D) Sound waves

3) E = 570 V/m

then B = E/c = 570/(3*10^8) = 1.9*10^-6 T = 1.9 uT

the answer is B) 1.9*10^-6 T

4) wavelength lamda = v/f = (3*10^8)/(900*10^6) =0.33 m

so the answer is E) 0.33 m

5) E_peak = sqrt(2)*Erms

so the answer is D) sqrt(2) times greater

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