# physics

A certain radar installation used to track airplanes transmits electromagnetic radiation of wavelength 7 cm.

(a) What is the frequency of this radiation, measured in billions of hertz (GHz)? __________GHz

(b) What is the time required for a pulse of radar waves to reach an airplane 3 km away and return? ________s

1. 👍 0
2. 👎 0
3. 👁 109
1. a) use the wave equation
frequency*wavelength=speed of light

b) time= 2*3km/speedlght

1. 👍 0
2. 👎 0
2. What is the time required for a pulse of radar waves to reach an airplane 7 km away and return?

1. 👍 0
2. 👎 0
posted by yelsaa

## Similar Questions

1. ### physics

A radar installation that is used to track airplanes transmits electromagnetic radiation with a wavelength of 4 cm. Calculate the frequency of this radiation in Hz.

asked by LL on July 1, 2012
2. ### physics

A radar installation that is used to track airplanes transmits electromagnetic radiation with a wavelength of 4 cm. Calculate the frequency of this radiation in Hz. Calculate the time required for a pulse of radar waves to reach

asked by LL on July 1, 2012
3. ### biology

9. A certain radar installation transmits electromagnetic radiation with a wavelength of 2.5 cm. What is the frequency of this radiation? 10. For the radar in #9 above, how many seconds will it take for a signal to reach an

asked by doranda on November 14, 2012
4. ### Science

1. A certain radar installation transmits electromagnetic radiation with a wavelength of 2.5 cm. What is the frequency of this radiation? 2. For the radar above, how many seconds will it take for a signal to reach an airplane 15

asked by Caroline on November 13, 2012
5. ### physics

A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 4.0 cm. a)Find the frequency of this radiation. b)Find the time required for a pulse of radar waves to reach an airplane 4.8 km

asked by Kristie on April 29, 2012
6. ### Physics

3.A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 3 cm. a) Show that the frequency of this radiation is 10 GHz. b) Show that the time required for a pulse of radar waves to

asked by Anonymous on May 12, 2010
7. ### Chem

which of the following statements is true regarding electromagnetic radiation? Options: 1. electromagnetic radiation with a wavelength of 600 nm travels faster than that with a wavelength of 400 nm. 2. the frequency of

asked by Ally on July 13, 2010
8. ### Astronomy

Based on what you learned about light, select all of the correct statements from the following list. The only type of electromagnetic radiation that is actually considered light is visible light. High frequency photons carry more

asked by Andy on November 9, 2011