What makes dark energy "dark"?A. its unknown nature
B. its completely black color
C. its existence beyond the visible spectrum
D. its inevitable creation of a totally destructive Big Crunch

Nucleosynthesis began when _____ and ended when _____.
A. the Big Bang occurred; the Big Crunch occurred
B. nuclear reactions could first occur; matter had condensed into galaxies and stars
C. the cosmic microwave background radiation formed; dark energy replaced it as the dominant energy form
D. the universe had cooled enough for atoms to combine; protons and neutrons were too far apart to form nuclei

The characteristics of electromagnetic waves typically represent as follows:

• There are changes in the electric and magnetic fields simultaneously so that both fields have maximum and minimum values ​​at the same time and place.
• The direction of the electric field and the magnetic field are perpendicular to each other. The direction of both is perpendicular to the direction of the wave propagation.
• The shape of electromagnetic waves is transverse waves.
• It has general wave characteristics like polarization, reflection, refraction, interference, and diffraction.
• The amount of the electric field (E) is directly proportional to the magnitude of the magnetic field, with the relationship E = cB.
• The universal constant of the velocity of electromagnetic waves in a vacuum is
• The speed at which electromagnetic waves propagate depends merely on the electrical and magnetic properties of the medium that it travels on.
• Because electromagnetic waves do not contain an electric charge, they do not experience any possible deviation in the electric or magnetic fields.

Further explanation

• Two physicists who contributed significantly to developing the concept of electromagnetic waves are Faraday and Maxwell around 1831-1864.
• From the observations, Faraday suggested that changes in the magnetic field cause an electric charge to flow in the loop of wire, contributing in the emergence of an electric field.
• Maxwell proposed a reverse process, which is a change in the electric field will generate a magnetic field.
• As follows, according to Faraday's Law, changes in sinusoidal magnetic fields generate electric fields which also change sinusoidally.
• Meantime, according to Maxwell's Hypothesis, changes in sinusoidal electric fields generate magnetic fields which also change sinusoidally.
• Furthermore, there is a process of combining electric and magnetic fields that propagate in all directions called electromagnetic waves.

Learn more

1. About vector components brainly.com/question/1600633
2. Determine the shortest wavelength in electron transition brainly.com/question/4986277
3. Particle's speed and direction of motion brainly.com/question/2814900

Keywords: the characteristics, electromagnetic waves, transverse, vacuum, electric fields, magnetic, perpendicular, propagation, Maxwell, Faraday, the speed, polarization, reflection, refraction, interference, and diffraction

Answer: reflection

Refraction

Energy

Speed

Explanation:

Reflection results when em wave hits a plane surface and returns in the same angle it incident

Refraction is the change in velocity and direction of em wave as it crosses boundaries of different medium

The energy of em wave is evenly distributed in electric field and magnetic field

The speed of em wave is the same as 3×10^8

256 kPa because p-guage + p-absolute + p-atmospheric = 256

Answer:

C. 256 kPa

Explanation

Answer:

No

Explanation:

The statement is implying that if you do a certain amount of work, you're entitled to do a certain amount of work. Sometimes, work doesn't entitle you a reward.  

Final answer:

Taking the stairs does not justify eating a whole 'Chocolate Fondue for Two' from a health perspective. The calories burned climbing stairs would not offset the number of calories consumed from the chocolate.

Explanation:

This question appears to be related more towards the subject of Health and nutritional decisions. Eating an entire 'Chocolate Fondue for Two' by yourself due to taking the stairs instead of the elevator does not necessarily justify the act from either a health or dietary perspective. While taking the stairs can increase your physical activity and burn some calories, the amount burned would not be significant enough to counterbalance the high calorie intake from consuming 1lb of dark chocolate. An average individual may burn around 10 calories for every minute they spend climbing stairs, which would not make up for the roughly 2,200 calories present in a pound of dark chocolate.

Learn more about Calorie Intake and Expenditure here:

brainly.com/question/8294164

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