Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. (a) How far away is the planet Venus if the echo time is 1000 s? (b) What is the echo time for a car 75.0 m from a Highway Police radar unit? (c) How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m?
Trending nowThis is a popular solution!
Chapter 24 Solutions
College Physics
Additional Science Textbook Solutions
College Physics: A Strategic Approach (4th Edition)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
University Physics with Modern Physics (14th Edition)
Sears And Zemansky's University Physics With Modern Physics
University Physics Volume 1
Essential University Physics: Volume 2 (3rd Edition)
- Radar is used to determine distances to various objects by measuring the round-trip time for an echo from the object, (a) How far away is the planet Venus if the echo time is 1000 s? (b) What is the echo time for a car 75.0 m from a highway police radar unit? (c) How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m?arrow_forwardWhen a television news anchor in a studio speaks to a reporter in a distant country, there is sometimes a noticeable lag between when the anchor speaks in the studio and when the remote reporter hears it and replies. Explain what causes this delay.arrow_forwardA radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?arrow_forward
- Conversations with astronauts on lunar walks had an echo that was used to estimate the distance to the Moon. The sound spoken by the person on Earth was transformed into a radio signal sent to the Moon, and transformed back into sound on a speaker inside the astronaut’s space suit. This sound was picked up by the microphone in the space suit (intended for the astronaut’s voice) and sent back to Earth as a radio echo of sorts. If the round-trip time was 2.60 s, what was the approximate distance to the Moon, neglecting any delays in the electronics?arrow_forwardRadar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. (a) How far away (in m) is the planet Venus if the echo time is 900 s? 270000000000 m (b) What is the echo time (in us) for a car 77.0 m from a Highway Patrol radar unit? 0.00000051333 X us (c) How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m? 66.66 nsarrow_forwardRadar is used to determine distances to various objects by measuring the round-trip time for an echo from the object. How accurately (in nanoseconds) must you be able to measure the echo time to an airplane 12.0 km away to determine its distance within 10.0 m?arrow_forward
- A space station while in orbit sends out a radar (EM) wave. It takes the wave 1.20seconds to strike an object and returnto the space station. How far away was the objectin units of metres?How far away was the object in units of miles?arrow_forwardA meteorologist for a TV station is using radar to determine the distance to a cloud. He notes that a time of 0.24 ms elapses between the sending and the return of a radar pulse. How far away is the cloud?arrow_forwardA radar pulse is sent out and reflects off an airplane. The echo of the pulse return 14.3 micro seconds after it was sent out. How far away is the airplane?arrow_forward
- A) Suppose a star is 4.15 ✕ 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? B) The Sun is 1.50 ✕ 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? C) The Moon is 3.84 ✕ 108 m from Earth. How long (in s) does it take for a radio transmission to travel from Earth to the Moon and back?arrow_forwardApproximately how long would it take a telephone signal to travel 5.46 x 10^10 m from Earth to Mars ?arrow_forwardA person on earth communicating via radio transmission with an astronaut on the moon asks a question. At the time of transmission the moon is 4.00 x 10^5 km from earth, and the speed of radio waves if 3.00 x 10^8 m/s. How long must the person on earth wait for a response if the astronaut answers 2.50 s after the message is received?arrow_forward