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
castortr0y [4]
3 years ago
14

In the phenomenon known as the Doppler Effect, electrons are ejected when light shines on certain substances. true or false

Biology
2 answers:
dexar [7]3 years ago
5 0

The answer is False.


Good luck.

patriot [66]3 years ago
4 0
It is false because the Doppler effect is something completely different <span />
You might be interested in
What could you make or do to make sure your bean plants stay upright and don’t fall down?
nlexa [21]

Answer:

I got this off of g o o g l e

Explanation:

I put pairs of small fence posts (one on each side) down the row. I then tied twine to the fence post and ran it on either side of the plants. This keeps them from falling over to the side. If you plant thick enough they won't fall to the front or back.

7 0
3 years ago
Read 2 more answers
How are fire extinguishers helpful?​
sesenic [268]

Answer:
Fire is one of humankind's oldest discoveries; it's also one of our biggest threats. A fire can destroy in a matter of minutes home or business that has taken decades to establish. That's why methods of putting out fires are so important. Many buildings are equipped with fire extinguishers, but why are there so many different kinds? What do they do to a fire? And how exactly do they work?

Fire extinguishers are helpful because they can save lives and property by putting out a small fire or suppressing it until the fire department arrives. Fire safety experts advise that you attempt to extinguish a fire only if you have first made sure that everyone else has left or is leaving the building, and that someone has called the fire department. Remember, lives are more important than property.

If those conditions have been met, you should pick up the fire extinguisher and attack the fire. Be careful to make sure that at all times your back is to a safe exit. You'll also want to make sure that the fire is confined to one area. If it begins to spread to other areas, such as walls and curtains, you should retreat from the room if there is a chance the fire could surround you.

You also want to beware of smoke. If the room begins to fill to the point that you can't see or breathe, you should retreat.


There are four main types of extinguishers and they work in slightly different ways:

Water extinguishers, which are the most common, are essentially tanks full of water, often with nitrogen or carbon dioxide as the propellant to make them come out. Water extinguishers work mainly by removing heat from the fire, though they also help to cut off a fire's oxygen supply.

Dry powder extinguishers are tanks of dry powder with compressed nitrogen as the propellant. In extinguishers like this, it's the composition of the chemical (rather than the mechanical design of the extinguisher) that really counts The powder is a specially designed mixture that absorbs heat, melts, and coats the fuel, stopping it from making flammable vapors and blocking out oxygen, so it's helping to tackle two sides of the fire triangle at once. The most widely used powder in extinguishers is monoammonium phosphate; other powder ingredients include the metal alkali salts sodium bicarbonate (baking soda) and potassium bicarbonate (similar to sodium bicarbonate), though these are less effective on things like wood and paper fires.

Foam extinguishers are tanks of water and foam with compressed nitrogen as the propellant. They work by smothering the fire: when you spread a thin layer of foam over a fire, you cut the fuel off from the oxygen around it. Foam extinguishers also help to absorb heat, since the cool foam they release contains a lot of water.

Carbon dioxide (CO2) extinguishers contain a mixture of liquid and gaseous carbon dioxide (a nonflammable gas). CO2 is normally a gas at room temperature and pressure. It has to be stored under high pressure to make it a liquid. When you release the pressure, the gas expands enormously and makes a huge white jet. CO2 attacks the fire triangle in two ways: it smothers the oxygen and, when it turns from a liquid back to a gas, it "sucks" in a massive amount of heat from its surroundings (the latent heat of vaporization), which cools whatever you spray it on by removing heat.

how are fire extinguishers helpful?​
They are helpful because they can save lives and can help you get out of a sticky situation. The stuff inside the fire extinguishers could be water, water, and foaming agent mixture, dry powder, wet chemical or CO2 gas compressed into a liquid. Propellant – this is what forces the extinguishing agent out of the fire extinguisher. It is often compressed nitrogen gas.

6 0
2 years ago
Read 2 more answers
A block of wood is at rest on a wooden ramp
worty [1.4K]
Idk what you mean sorry 
8 0
3 years ago
How many African Americans are carriers of the sickle-cell allele?
madam [21]
The answer is 1 in 11
- Ashley :)
5 0
3 years ago
Imprinting is a type of _______ behavior.<br> A.inherited<br> B.learned<br> C.reflex<br> D.instinct
grin007 [14]

Answer:

I think it is Learned

Explanation:

Hope this helps

5 0
3 years ago
Read 2 more answers
Other questions:
  • which of the following is the only evolutionary force that can create brand-new genetic variation within a population? a. mitosi
    11·1 answer
  • Solar panels (photovoltaic cells) still work when the panel is shaded.
    12·1 answer
  • There are initially 1000 bacteria in a culture. The number of bacteria doubles each hour. The number of bacteria N present after
    9·1 answer
  • Q 3.4: Samuel is asked to do the dishes after dinner, which he hates. Instead of doing the dishes he decides
    15·1 answer
  • A couple believe they have brought home the wrong baby from the hospital. The wife has brown eyes and blood type A; her husband
    13·1 answer
  • How many oxygen atoms are in one unit of the compound Ba(0H)2
    11·1 answer
  • All the following may cause the presence of a high percentage of fats in the wastes of the digestive system, except a disturbanc
    5·1 answer
  • Which of the following is true of gravity?
    13·1 answer
  • What might happen to renewable resource like trees if we use them?
    6·1 answer
  • Species evolve useing what process
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!