Atoms that emit particles and energy from their nuclei are (Radioactive).
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
2.4 secs I think
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Answer:
a)
16.33 Ω
b)
45009.18 A
Explanation:
a)
L = length of the line = 935 km = 935000 m
d = diameter of the line = 3.50 cm = 0.035 m
ρ = resistivity of the line = 1.68 x 10⁻⁸ Ω.m
Area of cross-section of the line is given as
A = (0.25) πd²
A = (0.25) (3.14) (0.035)²
A = 0.000961625 m²
Resistance of the line is given as
inserting the values
R = (1.68 x 10⁻⁸) (935000)/(0.000961625)
R = 16.33 Ω
b)
V = potential difference across the line = 735 kv = 735000 Volts
i = current carried by the wire
Using ohm's law, current carried by the wire is given as
i = 735000/16.33
i = 45009.18 A