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
LenaWriter [7]
3 years ago
9

Dish-shaped reflectors are used to steer microwaves in order to establish communications links between nearby buildings. Those r

eflectors are often made from metal mesh. Why don't they have to be made from solid metal sheets
Physics
1 answer:
Ad libitum [116K]3 years ago
5 0

A "screen" or even just a set of parallel bars are highly reflective to electromagnetic waves as long as the open spaces are small compared to the wavelengths.

"Grid" dishes work fine ... with less weight and less wind resistance ... for frequencies below about 3 GHz. (Wavelengths of at least 10 cm.)

(I even worked on a microwave system in South America where huge grid dishes were used on a 90-mile link.)

You might be interested in
What is true about X-rays and microwaves?
erma4kov [3.2K]
I believe the correct answer from the choices listed above is option C. X-rays have greater frequency than microwaves. In a electromagnetic spectrum, the order in increasing frequency is as follows:

radio waves,microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation,X-rays<span> and gamma </span>rays<span>.</span>
7 0
3 years ago
A table-tennis ball is thrown at a stationary bowling ball. The table-tennis ball makes a one-dimensional elastic collision and
Alecsey [184]

<u>Option b. </u>A smaller magnitude of momentum and more kinetic energy.

<h3>What is a momentum?</h3>
  • In Newtonian physics, an object's linear momentum, translational momentum, or simply momentum is defined as the product of its mass and velocity.
  • It has both a magnitude and a direction, making it a vector quantity. The object's momentum, p, is defined as: p=mv if m is the object's mass and v is its velocity (also a vector quantity).
  • The kilogram metre per second (kg m/s), or newton-second in the International System of Units (SI), is the unit used to measure momentum.
  • The rate of change of a body's momentum is equal to the net force exerted on it, according to Newton's second law of motion.

To know more about momentum, refer:

brainly.com/question/1042017

#SPJ4

7 0
2 years ago
The curved line PQR is the velocity-time graph for a car starting from rest.
Elden [556K]
His. Curbs I b h bs. H b u b
3 0
3 years ago
Which of the following objects is accelerating?
Schach [20]

Answer: A flower pot falling

Explanation:

3 0
3 years ago
Read 2 more answers
Using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before h
ASHA 777 [7]
If it starts from 0m/s...
s=?
u=0
a=-10
t=8
s=ut +1/2at^2
so s=(0×8)+ (0.5×-10×64)
s=0+(32×-10)
s=32×-10
s=-320metres
6 0
3 years ago
Other questions:
  • Calculate the broadcast wavelength of the radio station 99.90 fm. seconds
    9·1 answer
  • WILL GIVE BRAINLIEST AND 60 POINTS!
    13·1 answer
  • What will happen to the absorption and/or emission spectral lines of an object moving away from Earth at high speed?
    5·1 answer
  • Why do scientists believe that light is made of waves?
    14·1 answer
  • 4. A thermos bottle has two layers, a glass layer and a vacuum layer.
    9·1 answer
  • Jocelyn is running for the U.S Senate. What is one of the qualifications for office she must meet?
    13·2 answers
  • SOME ONE PLZ HELP WILL GIVE THE BRAINIEST
    11·1 answer
  • Water vapor is an example of a(n)
    6·1 answer
  • HELP!! ALL MY POINTS WILL BE GIVEN
    6·2 answers
  • If it takes you 10 seconds to move a chair 5 meters across the floor, using a force of 2 Newtons, how much power did you put out
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!