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
Mazyrski [523]
3 years ago
15

How do air quality scientists ensure the air is cleaned? What steps do they take?

Physics
1 answer:
bulgar [2K]3 years ago
3 0
Air sample of places around the world compared to clean air
You might be interested in
Please help really easy worth 20
vovangra [49]

Answer:

Stationary

20N

Explanation:

From the graph, we see that the body traveling is on a fixed position. Therefore, it is a stationary body.

The graph given is a position - time curve.

 This curve depict a body changing position with given time.

Since the line of the curve is on a single position, the body is not changing position with the passage of time therefore, it is a stationary object.

B. 20N

From Newton's third law of motion we understand that "action and reaction force are equal but oppositely directed".

 Since the person is exerting a force of 20N on the balance.

So, the reaction force by the balance is 20N upward.

4 0
3 years ago
Please help im being timed on this and need to get my grade up
nadya68 [22]

Answer:

a I think hope this helps

8 0
2 years ago
this event is the result of a sudden vertical offset in the ocean floor and is most often the result of plate movement on the oc
MissTica

Answer: Tsunami.

Explanation :

Tsunami is the result of a sudden vertical offset in the ocean floor and is most often the result of plate movement on the ocean floor.

Tsunami is caused due to the displacement of a large volume of water like in an ocean. It consists of a series of waves. It destroys coastlines and coastal settlements. It is also known as a tidal wave.

So, the correct option is (b) Tsunami.

6 0
3 years ago
When atoms of an element are excited, they emit specific wavelengths of light. How is this similar to a fingerprint when Fraunho
Anika [276]

Answer:

As you may know, each element has a "fixed" number of protons and electrons.

These electrons live in elliptical orbits around the nucleus, called valence levels or energy levels.

We know that as further away are the orbits from the nucleus, the more energy has the electrons in it. (And those energies are fixed)

Now, when an electron jumps from a level to another, there is also a jump in energy, and that jump depends only on the levels, then the jump in energy is fixed.

Particularly, when an electron jumps from a more energetic level to a less energetic one, that change in energy must be compensated in some way, and that way is by radiating a photon whose energy is exactly the same as the energy of the jump.

And the energy of a photon is related to the wavelength of the photon, then we can conclude that for a given element, the possible jumps of energy levels are known, meaning that the possible "jumps in energy" are known, which means that the wavelengths of the radiated photons also are known. Then by looking at the colors of the bands (whose depend on the wavelength of the radiated photons) we can know almost exactly what elements are radiating them.

7 0
3 years ago
What is the acceptable level for chlorine
Katena32 [7]
The EPA requires treated tap water<span> to have a detectable </span>level of chlorine<span> to help prevent contamination. The allowable </span>chlorine <span>in </span>drinking water<span> (up to 4 parts per million) pose “no known or expected health risk [including] an adequate margin of safety.”</span>
8 0
3 years ago
Other questions:
  • What is the approximate number of breaths a person takes over a period of 70 years?
    6·1 answer
  • What best describes the angle between a changing electric field and the electromagnetic wave produced by it? (2 points)
    8·2 answers
  • To properly record a measurements, you must record which of the following?
    9·1 answer
  • "a 10 kg rock is pushed off the edge of a bridge 50 meters above the ground. what was the kinetic energy of the rock at the midw
    9·1 answer
  • Which of the following correctly shows the chain of energy transfers that create surface currents on the ocean?
    11·1 answer
  • Pilots can be tested for the stresses of flying high-speed jets in a whirling "human centrifuge," which takes 1.2min to turn thr
    11·2 answers
  • An object of mass m1​= 5kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and the
    5·1 answer
  • What is potential energy ?
    6·2 answers
  • As a block falls through the air by 40 meter it does work equal to -1800 joule. Determine the mass of a block.
    13·1 answer
  • Choices are 10.7<br> 16.9<br> 15.2<br> 17.5
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!