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Papessa [141]
3 years ago
11

A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 4.0 cm.

Physics
2 answers:
KATRIN_1 [288]3 years ago
7 0

Answer:

a) frequency = 7.5 \times 10^9 hz

b) times = 3.2 \times 10^{-5} s

Explanation:

Part a)

As we know that frequency of radiation is given as

frequency = \frac{speed}{wavelength}

now we know that

speed = 3 \times 10^8 m/s

wavelength = 4 cm

now frequency is given as

f = \frac{3 \times 10^8}{4 \times 10^{-2}}

f = 7.5 \times 10^9 Hz

Part b)

Time required for the pulse to reach the airplane and return is given by formula

t = \frac{distance}{speed}

total distance for moving to and fro = 4.8 km + 4.8 km = 9.6 km

speed of the wave = 3 \times 10^8 m/s

now times is given as

t = \frac{9.6 \times 10^3}{3 \times 10^8}

t = 3.2 \times 10^{-5} s

Anna35 [415]3 years ago
3 0

the wavelength equation is

speed (of light in this case)= wavelength (m) x frequency

3x10^8m/s / .07m = f

frequency= 4 285 714 286 hertz

 

 

 

b) Total distance= 4.8 km (4,800 m)

Speed = 3x10^8 m/s

d=st

t= d/s

t= 4,800 m/3x10^8m/s

<span>t= 1x10^-5 seconds</span>

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