Electromagnetic waves from a radio station pass through an open window of a house. The square window has side length 0.75 m and the waves pass through perpendicular to the window's area. The electric field is measured at the window and found to be 0.02 V/m. In air, we can use the vacuum permeability = 4 x 10-7 H/m. (i) What is the magnitude of the Poynting vector, S, for the radio waves passing through the window? (ii) How much energy do the radio waves carry through the window during a 2-minute-long broadcast of BBC Radio 4's shipping forecast? [Hint: think of the units of S [units = (J/s)/m²] and Energy [units = J].
Electromagnetic waves from a radio station pass through an open window of a house. The square window has side length 0.75 m and the waves pass through perpendicular to the window's area. The electric field is measured at the window and found to be 0.02 V/m. In air, we can use the vacuum permeability = 4 x 10-7 H/m. (i) What is the magnitude of the Poynting vector, S, for the radio waves passing through the window? (ii) How much energy do the radio waves carry through the window during a 2-minute-long broadcast of BBC Radio 4's shipping forecast? [Hint: think of the units of S [units = (J/s)/m²] and Energy [units = J].
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![3. Electromagnetic waves from a radio station pass through an open window
of a house. The square window has side length 0.75 m and the waves pass
through perpendicular to the window's area. The electric field is
measured at the window and found to be 0.02 V/m. In air, we can use the
vacuum permeability = 4 x 10-7 H/m.
(i) What is the magnitude of the Poynting vector, S, for the radio waves
passing through the window?
(ii) How much energy do the radio waves carry through the window during
a 2-minute-long broadcast of BBC Radio 4's shipping forecast? [Hint:
think of the units of S [units = (J/s)/m²] and Energy [units = J].](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa94ef811-7aeb-45cc-a8c4-872250660697%2Fdb837dc4-ab85-435b-819b-eb60c1bb4c38%2Fv6srcwc_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3. Electromagnetic waves from a radio station pass through an open window
of a house. The square window has side length 0.75 m and the waves pass
through perpendicular to the window's area. The electric field is
measured at the window and found to be 0.02 V/m. In air, we can use the
vacuum permeability = 4 x 10-7 H/m.
(i) What is the magnitude of the Poynting vector, S, for the radio waves
passing through the window?
(ii) How much energy do the radio waves carry through the window during
a 2-minute-long broadcast of BBC Radio 4's shipping forecast? [Hint:
think of the units of S [units = (J/s)/m²] and Energy [units = J].
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