A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
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The image as shown here can here can be used to describe charging by induction.
<h3>What is a charge?</h3>
A charge may be positive or negative. One of the methods of transferring a charge is by induction.
In this case, an objects induces an opposite charge on a material. The image as shown here can here can be used to describe charging by induction.
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Answer: True
Refraction is a phenomenon in which the light bends or changes its direction (and changes the speed of propagation, as well) <u>when passing through a medium</u> with a refractive index 
<u>different from the other medium. </u>
Where the Refractive index is a number that describes how fast light propagates through a medium or material:
Being a relation between the speed of light in vacuum 
and its speed in the other medium 
.
It is important to note that in this process, the wavelength may be modified because it depends on the medium, however, the refracted ray of light does not change its frequency.
Answer:
2. The hydrogen atom has quantized energy levels.
Explanation:
The Bohr model of the atom states that the structure of the atom is quantized, that is, that electrons can only orbit the nucleus in specific orbits with a fixed radius. Therefore, the electron cannot be in energy levels that do not correspond to these quantized levels.
Answer:
The second car must go with a speed of 63.43 m/sec
Explanation:
Speed V of lead car = 62.3 m/sec
Distance S = 55 laps = 55 ×400 meters=22000 m
We know
S = V × t
So,
t= S/V
We put values of S and V here, we get
t=22000/62.3
t= 353.1 sec
So in 353.1 sec the second car which is one lap behind - must go a distance of 55+1=56 laps or 56×400 m = 22400 meters to catch the lead car before it finishes.
i-e for second car
Distance S= 22400m
Time t = 353.1 sec
V= ?
using again
S=Vt
we get
V= S/t
V= 22400/353.1= 63.43 m/sec
