Answer:1.27
Explanation:
Given
incident angle ![i=36^{\circ}](https://tex.z-dn.net/?f=i%3D36%5E%7B%5Ccirc%7D)
refracted angle ![r=27.5^{\circ}](https://tex.z-dn.net/?f=r%3D27.5%5E%7B%5Ccirc%7D)
Suppose
is the refractive index of material then using Snell's law we can write
![n_1\sin i=n_2\sin r](https://tex.z-dn.net/?f=n_1%5Csin%20i%3Dn_2%5Csin%20r)
where
=refractive index of air
![1\times \sin (36)=n_2\times \sin (27.5)](https://tex.z-dn.net/?f=1%5Ctimes%20%5Csin%20%2836%29%3Dn_2%5Ctimes%20%5Csin%20%2827.5%29)
![n_2=\dfrac{0.5877}{0.4617}](https://tex.z-dn.net/?f=n_2%3D%5Cdfrac%7B0.5877%7D%7B0.4617%7D)
![n_2=1.27](https://tex.z-dn.net/?f=n_2%3D1.27)
Answer:
I = 0.058 [A]
Explanation:
Ohm's law is defined as voltage equal to the product of current by resistance.
![V =I*R](https://tex.z-dn.net/?f=V%20%3DI%2AR)
where:
V = voltage = 4.2 [V]
I = current [amp]
R = resistivity = 72 [ohm]
Now clearing I, we have:
![I = V/R\\I = 4.2/72\\I = 0.058 [A]](https://tex.z-dn.net/?f=I%20%3D%20V%2FR%5C%5CI%20%3D%204.2%2F72%5C%5CI%20%3D%200.058%20%5BA%5D)
Answer:
1.16 .
Explanation:
In the product of two or more physical quantities , the number of places after decimal in the result can never be more than least number of place after decimal in the quantities that are being multiplied .
Here numbers that are being multiplied are ,
1.12 , 1.25, and .83 , each containing two digits after decimal . So the product can not contain more than two digits after decimal . The principle behind it is that the result can not have more precision than the precision of amount that are being multiplied.
so
1.12 x 1.25 x .83 = 1.162 to be rounded off to 1.16 .
The answer is 1.16.