1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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>

You might be interested in
Inappeopiate pratices: what it means? Why it not good idea to use these?
Rina8888 [55]

Answer:

Inappropriate practice is conduct by a practitioner in connection with rendering or initiating services that a practitioner's peers could reasonably conclude was unacceptable to the general body of their profession.

Explanation:

5 0
3 years ago
A mass m at the end of a spring oscillates with a frequency of 0.89 hz. when an additional 603 g mass is added to m, the frequen
MrMuchimi

The solution for this problem:

Given:

f1 = 0.89 Hz

f2 = 0.63 Hz

Δm = m2 - m1 = 0.603 kg 


The frequency of mass-spring oscillation is: 
f = (1/2π)√(k/m) 
k = m(2πf)² 

Then we know that k is constant for both trials, we have: 
k = k 


m1(2πf1)² = m2(2πf2)² 

m1 = m2(f2/f1)² 


m1 = (m1+Δm)(f2/f1)² 


m1 = Δm/((f1/f2)²-1)

 m 1 = 0.603/ (0.89/0.63)^2 – 1

= 0.609 kg or 0.61kg or 610 g

5 0
3 years ago
Balok diam diatas bidang miring pada sudut kemiringan 40° balok mulai bergerak,tentukan koefisien gesek statis antara balok dan
Pachacha [2.7K]

Answer:

0.84

Explanation:

m = Massa balok

g = Percepatan gravitasi

\theta = Sudut kemiringan

\mu = Koefisien gesekan statik antara balok dan bidang miring

Gaya balok karena beratnya diberikan oleh

F=mg\sin\theta

Gaya gesekan diberikan oleh

f=\mu mg\cos\theta

Kondisi dimana balok mulai bergerak adalah ketika gaya balok akibat beratnya sama dengan gaya gesek pada balok.

mg\sin\theta=\mu mg\cos\theta\\\Rightarrow \mu=\dfrac{mg\sin\theta}{mg\cos\theta}\\\Rightarrow \mu=\tan\theta\\\Rightarrow \mu=\tan40^{\circ}\\\Rightarrow \mu=0.84

Koefisien gesekan statik antara balok dan bidang miring adalah 0.84.

7 0
3 years ago
All contraceptives prevent STIs true or false
NNADVOKAT [17]
False. Not all contraceptives prevent STIs.

Contraceptives are items used or taken to prevent conception. These are birth control pill, patch, ring, IUD, birth control shots, and condoms. Among these contraceptives, condoms are the only type of birth control that prevents STIs or Sexually Transmitted Infections.
7 0
3 years ago
True or false it is impossible to determine weather you are moving unless you can touch another object
Lerok [7]

Answer: false

Explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • When a ball strikes a surface , it changes its shape temporarily, what type of energy is stored with the ball as it is compresse
    10·1 answer
  • A shot putter releases the shot some distance above the level ground with a velocity of 12.0 m/s, 51.0 ∘above the horizontal. Th
    9·1 answer
  • The property that describes how radily a substance combines chemically with other substances is _____________
    11·1 answer
  • What is hooke's law? Also what does it say about how elastic materials respond to force? Explain.
    9·1 answer
  • A calorimeter has aluminum inner cup of mass 120 gram containing 200 ml water at temperature 20 degree Celsius. Brass piece with
    5·2 answers
  • A train travels 120 km at a speed of 60 km/h, makes a stop for 0.5 h, and then travels the next 180 km at a speed of 90 km/h. Wh
    8·1 answer
  • 2) How many significant figures are in the number 0.0037010?<br>​
    8·1 answer
  • Is cosine function always used to find x component velocity in resolving vectors
    5·1 answer
  • A particle A of mass 2kg originally moving with a velocity of 3ms collides directly with another particles B of mass 2kg moving
    7·1 answer
  • Suppose the spark plug on a heat engine is not functioning properly which statement best explains how this will affect the engin
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!