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

b) time= 2*3km/speedlght

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

1. 👍
2. 👎

## Similar Questions

1. ### Chemistrty Help

Calculate the wavelength of each of the following frequencies of electromagnetic radiation. 1040 kHz} (typical frequency for AM radio broadcasting) (assume four significant figures) in METERS? Can someone help me?

2. ### Science

1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm? Answer in units of s−1 . 2.Microwaves, such as those used for radar and to heat food in a microwave

3. ### Chemistry

Some instruments differentiate individual quanta of electromagnetic radiation based on their energies. Assume such an instrument has been adjusted to detect quanta that have 3.50× 10–16 J of energy. What is the wavelength of

4. ### 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

1. ### Science

Which of the following statements about electromagnetic radiation is true? A. It transfers energy to objects of the electromagnetic waves. B. It can be converted to other energy forms. C. It transports the energy of

2. ### Chemistry

Electromagnetic radiation with a wavelength of 665 nm appears as orange light to the human eye. The energy of one photon of this light is __________ J.

3. ### science

What is the wavelength of waves transmitted by an AM radio station operating at a frequency of 840 kilohertz? Calculate the energy of a photon whose frequency is 2450 megahertz What is the difference in energy for a photon of

4. ### science

Electromagnetic radiation with a wavelength of 700 nm would be: a)x-rays b)red light c)violet light d)ultraviolet light e)microwaves I thought it would be visible light but that's not an option.

1. ### physics

Which of the following statements about electromagnetic radiation is true? -It transfers energy to objects in the path of the electromagnetic waves. -It can be converted to other energy forms. -It transports the energy of

2. ### chem

the wavelength of ligh is 310 nm. calculate the frequency? what is the wavelength of electromagnetic radiation if its frequency is 3.2 X 10 -2(exponent) Hz??

3. ### 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

4. ### metreology

Wien’s radiation law says that the wavelength of most intense radiation (λmax) emitted by a blackbody is inversely proportional to the absolute temperature (T) of the object. The surface of the Sun radiates as a blackbodyat a