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7) A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves? A) 442 Hz B) 351 Hz C) 419 Hz D) 322 Hz E) 670 Hz 8) A vertically polarized beam of light of intensity 100 W/m² passes through two polarizers. The first polarizer is making an angle of 20° with its transmission axis and the second one is making an angle of 40° with its transmission axis. What is the transmitted intensity of this beam of light? A) 22.2 W/m² B) 44.4 W/m² C) 66.6 W/m² D) 78.0 W/m² E) 11.7 W/m² 9) A 45-mH inductor is connected in series with a 60-Ω resistor through a 15-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the current after 7.0 ms? A) 250 mA B) 650 mA C) 550 mA D) 280 mA E) 850 mA 10) The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil? A) 100 V B) 30 V C) 70 V D) 480 V E) 400 V

          7) A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves? A) 442 Hz B) 351 Hz C) 419 Hz D) 322 Hz E) 670 Hz

8) A vertically polarized beam of light of intensity 100 W/m² passes through two polarizers. The first polarizer is making an angle of 20° with its transmission axis and the second one is making an angle of 40° with its transmission axis. What is the transmitted intensity of this beam of light? A) 22.2 W/m² B) 44.4 W/m² C) 66.6 W/m² D) 78.0 W/m² E) 11.7 W/m²

9) A 45-mH inductor is connected in series with a 60-Ω resistor through a 15-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the current after 7.0 ms? A) 250 mA B) 650 mA C) 550 mA D) 280 mA E) 850 mA

10) The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil? A) 100 V B) 30 V C) 70 V D) 480 V E) 400 V

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