Using a good pair of binoculars, you observe a section of the sky where there are stars of many different apparent brightnesses. You find one star that appears especially dim. This star looks dim because it is:_______.
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Answer:
Using a good pair of binoculars, you observe a section of the sky where there are stars of many different apparent brightnesses. You find one star that appears especially dim. This star looks dim because it is farther away or it has a small radius.
Explanation:
Apparent magnitude in astronomy is the apparent brightness of a star that is seen from the Earth, that brightness can variate according to the distance at which the star is from the Earth or due to its radius.
That can be demonstrate with the next equation:
(1)
Where F is the radiant flux received from the star, L its intrinsic luminosity and r is the distance.
For example, an observer sees two motorbikes approaching it with its lights on but one of the motorbikes is farther, so the light of this one appears dimmer, even when the two lights emit the same amount of energy per second.
That is because the radiant flux decreases with the square distance, as can be seen in equation 1.
In the other hand, a bigger radius means that the gravity in the surface of the star will be lower, allowing that light can escape more easily:
(2)
Where g is the surface gravity in the star, G is the gravitational constant, M is the mass of the star and R is the radius of the star.
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Matter can be defined as something that has mass and occupies space. They are present in the atmosphere in different phases. Thus, the correct option is C.
What is Matter?
Matter is any substance which is made up of various types of particles that occupies some physical space and has mass. According to the modern physics, there are various types of particles with each having a specific mass and size. The most common examples of these material particles are electrons, protons and neutrons.
Matter is present in different phases in the atmosphere. The three phases are solids, liquids, and gases. All of these phases show mass and occupies some space.
Therefore, the correct option is C.
Learn more about Matter here:
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Answer: C
Explanation:
Matter is anything that has mass and takes up space. People, paper, goats, chairs and even water is Matter!
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N
2. What is the force of friction acting on the car by the road?.
N
3. What is the coefficient of kinetic friction between the car and the road?
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It is a true fact that the loss of an organism at the bottom of a food chain negatively impacts all organisms in the chain.
Explanation:
This is because if the below organism which is constantly interchanged with plants, no herbivores would eat those plants, thus, will also die, which will also determine that the next consumers will have trifle to eat which will also happen to their deaths. So, yes. It concerns it negatively. And very negatively.