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
DENIUS [597]
2 years ago
11

How are electromagnetic waves used in a bar-code scanner?

Physics
1 answer:
meriva2 years ago
5 0

The electromagnetic waves used in a bar-code scanner by  an image is produced when a silicon chip releases electrons by the photoelectric effect and  Visible light is reflected off an object and then captured by a charge-coupled device.

<h3>What is electromagnetic wave?</h3>

The electromagnetic wave is the white light or Sunlight coming directly from the Sun. This light ray is the form of wave. This light when falls on any object segregates into the range of all types of EM radiation.

Radiation is packet of energy that travels and spreads out. It has radio waves, infrared waves and visible light waves, ultraviolet rays and microwaves.

Bar code scanner uses the photoelectric effect and visible light reflection phenomenon.

Thus, the correct options are A and C.

Learn more about electromagnetic wave.

brainly.com/question/3101711

#SPJ1

You might be interested in
Based on the table above, _______ planets are made of the same things as _______ moons.
wolverine [178]

Answer:

b

Explanation:

3 0
3 years ago
Before the experiment, the total momentum of the system is 2.5 kg m/s to the right and the kinetic energy is 5J. After the exper
finlep [7]

Answer:

Option (b) is correct.

Explanation:

Elastic collision is defined as a collision where the kinetic energy of the system remains same. Both linear momentum and kinetic energy are conserved in case of an elastic collision.

Inelastic collision is defined as a collision where kinetic energy of the system is not conserved whereas the linear momentum is conserved. This loss of kinetic energy may due to the conversion to thermal energy or sound energy or may be due to the deformation of the materials colliding with each other.

As given in the problem, before the collision, total momentum of the system is 2.5~Kg~m~s^{-1} and the kinetic energy is 5~J. After the collision, the total momentum of the system is  2.5~Kg~m~s^{-1}, but the kinetic energy is reduced to 4~J. So some amount of kinetic energy is lost during the collision.

Therefor the situation describes an inelastic collision (and it could NOT be elastic).

5 0
3 years ago
Which of the following represents the greatest energy transition from a higher energy level to a lower one?
prohojiy [21]
You need to use Planck's law:
E = h·υ = (h·c)/λ

Without making all the calculations, a fraction is bigger than another when the denominator is smaller. Therefore you need to find the smallest wavelength (λ) which is 450nm.

You could also be helped by colors: in order of decreasing energy, you have blue - green - yellow - red.

In any case, the correct answer is a).
8 0
3 years ago
What is the precision for each measurement for the online simulation. What would be the precision for force
zimovet [89]

Answer:

Unit of precision for force is the Newton.

Explanation:

It is the official unit used to describe force in science and mostly abbreviated with the symbol N.

4 0
3 years ago
What are some examples of static force?
Stella [2.4K]
Glass on glass,tire on concrete,tire on snow

4 0
3 years ago
Read 2 more answers
Other questions:
  • How much does 1 liter of water weigh
    14·1 answer
  • which of the following do you calculate when you divide the total distance traveled by the total travel time
    13·2 answers
  • The discharge of a stream is Choose one: likely to decrease downstream in arid regions and increase downstream in temperate regi
    13·1 answer
  • A brass rod 175.00 mm long and 5.00 mm in diameter extends horizontally from a casting at 200°C. The rod is in an air environmen
    5·1 answer
  • If a tree falls in the middle of the woods and nobody is around to hear it, does it make a sound?
    5·2 answers
  • Find the angle (above the horizontal) at which a projectile achieves its maximum range, if y=y0.
    11·1 answer
  • HEY CAN ANYONE PLS ANSWER DIS!!!!!!
    6·2 answers
  • A solid sphere with a moment of inertia of 2.20 kgm2 is rolling along the ground (without slipping) with an angular velocity of
    12·1 answer
  • A beam of light with a wavelength 760 nm in air travels in water. The index of refraction of water is 1.33. What is the waveleng
    14·1 answer
  • A track star runs 100 meters in 10 seconds. What is the star's average speed?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!