What's the diameter of a dish antenna that will receive 10−20W of power from Voyager at this time?

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Item 8 8 of 15 Constants | Periodic Table The Voyager 1 spacecraft is now beyond the outer reaches of our solar system, but earthbound scientists still receive data from the spacecraft's 20-W radio transmitter. Voyager is expected to continue transmitting until about 2025, when it will be some 25 billion km from Earth. Part A What's the diameter of a dish antenna that will receive 10-20 W of power from Voyager at this time? Assume that the radio transmitter on Voyager transmits equally in all directions(isotropically). In fact, the antenna on Voyager focuses the signal in a beam aimed at the earth, so this problem over-estimates the size of the receiving dish needed. Express your answer to two significant figures and include the appropriate units. d= Value Units Request Answer Submit Provide Feedback Next > Item 8 8 of 15 Constants | Periodic Table The Voyager 1 spacecraft is now beyond the outer reaches of our solar system, but earthbound scientists still receive data from the spacecraft's 20-W radio transmitter. Voyager is expected to continue transmitting until about 2025, when it will be some 25 billion km from Earth. Part A What's the diameter of a dish antenna that will receive 10-20 W of power from Voyager at this time? Assume that the radio transmitter on Voyager transmits equally in all directions(isotropically). In fact, the antenna on Voyager focuses the signal in a beam aimed at the earth, so this problem over-estimates the size of the receiving dish needed. Express your answer to two significant figures and include the appropriate units. d= Value Units Request Answer Submit Provide Feedback Next >