Two Radio Antennas Are 10 Km Apart on a North-South

question 83

Multiple Choice

Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast.The antennas broadcast identical AM radio signals,in phase,at a frequency of 4.70 MHz.A steamship,200 km offshore,travels toward the north at 15 km/h and passes east of the antennas.A radio on board the ship is tuned to the broadcast frequency.The reception of the radio signal on the ship is a maximum at a given instant.How much later until the next occurrence of maximum reception? (c = 3.00 × 10⁸ m/s)

• A)5.1 min
• B)3.8 min
• C)6.4 min
• D)7.7 min
• E)8.9 min

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