The distance between the charge and the source of the electric field is 2.2 m.
The potential energy <em>U</em> of a charge <em>q</em> placed in an electric field created by a source charge <em>Q</em>, at a distance <em>r</em> from the source charge is given by,
...... (1)
Here, <em>k</em> is the Coulomb constant.
The electric field <em>E</em> at a distance <em>r</em> from the source charge is given by,
......(2)
From equations (1) and (2)
Rewrite the expression for <em>ri.</em>
Substitute 75 J for <em>U</em>, for <em>E</em> and for <em>q</em>.
Rounding off to the nearest tenth, the the distance between the charge and the source charge is 2.2 m
There’s nothing to answer to
The frequency of light wave is 0.6*10^15 Hz.
The relation between the speed of light, frequency, and wavelength is given as
c=λν
Plugging the values in the above equation
3*10^8=5*10^(-7)*ν
ν=0.6*10^15 Hz.
Therefore the frequency of the light wave is 0.6*10^15 Hz.
Answer:
A. Heat flows from an object at higher temperature to an object at lower temperature
Explanation:
The option A obeys the 2nd law of thermodynamics. The heat will flow from the object at higher temperature to the object at Lower temperature till they reach an equilibrial state.
Heat doesn’t necessarily flow from an object with higher thermal energy to an object with lower thermal energy because an object has a higher thermal energy when it’s mass is more than the other. This makes B wrong.
C is wrong because heat moves from an object with higher temperature to objects with Lower temperature regardless of the state of matter.