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
Dahasolnce [82]
3 years ago
7

Why is charcoal black?

Physics
1 answer:
WARRIOR [948]3 years ago
8 0
The answer is C. 

I just took the test!

Hope this helps. :)
You might be interested in
Which of the following is a chemical change?
klemol [59]

a). Water is still H₂O after it freezes.

b). Ice is still H₂O after it melts.

c). Wire is still Cu when it's bent.

d). Paper combines with the O₂ in the air, and turns into
     a lot of new compounds when it burns.

3 0
3 years ago
1. Which is an advantage of coal energy?​
pentagon [3]
Coals energy is affordable and it is easy to burn.
4 0
3 years ago
Read 2 more answers
The energy of a photon of light is __________ proportional to its frequency and __________ proportional to its wavelength.
icang [17]

Answer:

D) directly, inversely

Explanation:

The energy of a photon of light is directly proportional to its frequency and inversely proportional to its wavelength.

Frequency is the number of waves that passes through a point per unit of time.

Wavelength is the is the distance between successive crests or troughs on a wave.

 Mathematically, frequency is related to wavelength and velocity using;

             Energy   =  h x f

                      where h is the Planck's constant

                                  f is the frequency

         

                   Since c  = f ∧

where f is the frequency of the wave

           ∧ is the wavelength of the wave

           c is the speed of light

So;

                 f  = c/∧

  Therefore;

                E  = \frac{h c}{wavelength}

From the equation, we see an inverse relationship between E and wavelength and a direct one with frequency.

           

6 0
3 years ago
Explain how a step-down transformer makes electricity safe for use in homes.
Savatey [412]

Answer:

it lowers the voltage in homes

Explanation:

this is due to safety reasons as a human cant survive power line voltages which are between 150k and 760k and if you plugged anything short of a piece of 1 inch thick wire not counting insulation it would immediately start smoking and burn the cable.

3 0
3 years ago
Read 2 more answers
3. In the wave models, you imagined adding energy into the wave by
castortr0y [4]

Answer:

by moving your hands up and down your we're creating transverse wave which travel in a right angle shape towards your friend

7 0
3 years ago
Other questions:
  • Objects in free fall near the surface of the earth accelerate downward at what rate
    6·2 answers
  • What is the state of matter that consists of a gas-like mixture of free electrons and nucle of atoms that have been stripped of
    15·1 answer
  • Find the electric flux through a cylindrical Guassian surface produced by a point charge at base.
    5·1 answer
  • What is the largest tsunami ever recorded
    6·1 answer
  • A 50 kilogram woman wearing a seatbelt is traveling in a car that is moving with a velocity of +10 meters per second. In an emer
    8·1 answer
  • A light string is wrapped around the edge of the smaller disk, and a 1.50 kgkg block is suspended from the free end of the strin
    15·1 answer
  • Which descriptions apply to Mendels pea plant experiments ? Select three options
    5·1 answer
  • How dose storing waste underground can be effected by ground water in aquifers<br><br>​
    11·1 answer
  • Indicate all the forces acting on a block of wood​
    9·1 answer
  • As a person pushes a box across a floor, the energy from the person's moving arm is transferred to the box, and the box and the
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!