Answer:
They can be penetrated only with longer wavelengths such as radio and infrared.
Explanation:
A dark nebula can be defined as an interstellar cloud that is so dense as a result of high concentration of gas and dust and as such it obscures the visible wavelengths of light from stars behind it, thus appearing completely opaque (dark patch) in front of a bright emission nebula or in regions having plenty stars.
<em>Hence, dark nebulae can be penetrated only with longer wavelengths such as radio and infrared light because they cannot be absorbed by the dust layers or particles coated with frozen carbon monoxide and nitrogen residing in the dark nebulae</em>.
The force exerted on Alice’s foot as she kicks the ball is 1.25 N.Force can be defined as the influence that can accelerate the object.
<h3>
What is force?</h3>
Force can be defined as the influence that can accelerate the object. From Newton's Second Law of motion,
Where,
- force
- mass = 0. 25 kg
- acceleration = 5 N
Put the values in the formula,
Therefore, the force exerted on Alice’s foot as she kicks the ball is 1.25 N.
Learn more about Force:
brainly.com/question/2840101
Multiplied by; speed = distance x time
To solve this problem we will use Snell's law. This law is used to calculate the angle of refraction of light by crossing the separation surface between two means of propagation of light (or any electromagnetic wave) with a different index of refraction.
Where,
= Index of refraction for each material
= Angle of incidence and refraction
A ray of light propagating in a medium with index of refraction 
hitting an angle on the surface of a medium of index 
with 
can be fully reflected inside the medium of highest refractive index:
Refractive index of rarer medium
Refractive index of denser medium
Replacing we have,
the critical angle of this fiber at the glass-plastic interface is 60.07°
Answer:
A: all colors, because black is the absence of color.
Explanation:
