Linear expansivity, area expansivity and volume or cubic expansivity are
Answer:
(D)
Explanation:
Given :
l=3.5 m


Resistance can be calculated as :


Resistance of the wire will be 1.1×
ohms
Option D is correct
Answer:
Explanation:
a )
Frequency n = 450 x 10⁶ .
20 light years = 20 x 9.461 x 10¹⁵m
Let power of source be P
Intensity at distance R = 
Substituting the given values
8.5 x 10⁻¹⁰ = 
P = 3822457 x 10²⁰ W.
b )
Half the power will be from electric and half will be from magnetic field.
Total power = 8.5 x 10⁻¹⁰ W
Half = 4.25 x 10⁻¹⁰ W .
power of electric field
= 
ε is permittivity , E₀ is amplitude of electric field , c is velocity of light .
Putting the values
4.25 x 10⁻¹⁰ = .5 x 8.85 x 10⁻¹² x E² x 3 x 10⁸
E₀² = .32 x 10⁻⁶
E₀ = .565 x 10⁻³ W / s .
Answer:
3 mps
Explanation:
So we want to convert this into a unit rate. So we take 30/10=3. So 3 meters per second.