Please answer all questions 1. An electromagnetic wave in a vacuum has a magneti

Question

Please answer all questions

1. An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.58 × 10-6 T. What is the intensity S of the wave?

2.In a dentist's office an X-ray of a tooth is taken using X-rays that have a frequency of 7.93 × 1018 Hz. What is the wavelength in vacuum of these X-rays?

3. An electromagnetic wave strikes a 1.70-cm2 section of wall perpendicularly. The rms value of the wave's magnetic field is determined to be 8.27 × 10-4 T. How long does it take for the wave to deliver 2150 J of energy to the wall?

Explanation / Answer

1.

here by using the formula

S = c * B^2 / u0

S = 3 * 10^8 * (1.58 * 10^-6)^2 / ( 4 * pie * 10^-7)

S = 596 W/m^2

2.

wavelength = speed / frequency

lambda = 3 * 10^8 / 7.93 * 10^18

lambda = 3.78 * 10^-11 m

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