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FromTheMoon [43]
3 years ago
8

What element are the cores of massive stars made of when a supernova occurs?

Physics
1 answer:
Studentka2010 [4]3 years ago
8 0
I think its C. Oxygen 
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HELP!<br> how did Mario Molina contribute to science?<br><br> i need like a mini paragraph:(
charle [14.2K]

Mario Molina helped to bring about the 1987 Montreal Protocol on substances that result in depletion of the Ozone Layer.

<h3>What is ozone layer?</h3>

The topmost layer of the atmosphere which protect the harmful UV rays from the Sun to reach the Earth surface.

Mario Molina has the great contribution in science field. He tried hard and succeeded in passing an international agreement to eliminate CFCs also called as Chloro Fluoro Carbons and other ozone-depleting chemicals.

These CFCs were used in jet planes which depleted the ozone layer and a hole was observed over Antarctica.

Learn more about ozone layer.

brainly.com/question/14330630

#SPJ1

7 0
2 years ago
Wavelength is measured in hertz true or false?
g100num [7]
Wavelength is measured in various units of distance (mm, cm, m, etc.). Frequency uses hertz, but that is not what the question is asking. Therefore, the answer is false.
3 0
3 years ago
Help please*_*
DochEvi [55]

Answer:

3.83×10⁻¹⁹ J

Explanation:

The energy of a photon can be found using the formula: E=hc/λ

  • h is Planck's Constant which is approximately 6.63×10⁻³⁴
  • c is the speed of light which we'll round to 3.00×10⁸
  • λ is the wavelength of the photon. You typed 5200 but that's not even within the visible light spectrum's wavelength range, so I'm going to assume you meant 520 nm; or 5.20×10⁻⁷ m.

Plugging all that info in should give approximately 3.83×10⁻¹⁹ Joules of energy.

(You could get slight variations depending on what you chose to round up or down or not at all.)

5 0
3 years ago
Sounds are produced by objects that are______
ahrayia [7]

Answer: Vibrating

Explanation:

Sound is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound is a form of mechanical energy.

7 0
3 years ago
Perception of color is determined by the wavelength of light that an object reflects
7nadin3 [17]

Answer:

True

Explanation:

hope I could help :)

8 0
4 years ago
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