Answer:
724,000,000,000 =
Explanation:
To convert a number into scientific notation, we have to find how many digits are after the first digit so:
7, 2 4 0 0 0 0 0 0 0 0 0
11 digits are after 7
Meaning to make it into scientific notation, the power of 10 would be 11
<span>We know that pressure is the force applied into a surface, in our case the wall of the room, so then first we will calculate the surface of this wall:
S = 2.2 * 3.2 = 7.04 m2
Then we also know the atmospheric pressure in normal conditions is 1 atm. That is the same 1 atm = 101325 Pascals or 101325 N/m2
Now we need to use the formula : P = F/S where P is pressure, F is force and S is surface to calculate the force:
F = P * S = 101325 * 7.04 = 713,328 Newtons
Conclusion: the force acts on the wall due the air inside the room is 713,328 N</span>
Answer:
No.
<em>Electromagnetic waves do not need a medium to travel through. </em>
Explanation:
Wave: A wave is a disturbance which travel through a medium and transfer energy from one point to another without causing any permanent displacement of the medium itself.
Waves are classified into two
(i) Mechanical Wave:These are waves that require a material medium for their propagation. E.g water wave, wave generated in a spring, and sound wave.
(ii) Electromagnetic wave: These are waves that do not require a material medium for their propagation. E.g light rays, radio wave, x-rays and gamma rays.
<em>Thus from the above explanation, electromagnetic waves do not need a medium to travel through. </em>
Answer:
critical angle is the angle of incidence in optically denser medium, for which the angle of reflection in the less denser medium is 90 degree
Explanation:
total internal reflection occurs at one particular angle of incidence where the reflected ray lies on the boundary.
this angle is called the critical angle