D.Simple Machine, is right.
Answer:
The seed as a fraction of the speed of light is ![\frac{3}{5}c](https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B5%7Dc)
Solution:
As per the question:
Suppose,
be the rate of an identical clock between two time intervals.
For a moving clock, moving with velocity 'v', at the clock tick of four-fifth:
t = ![\frac{5}{4}t_{i}](https://tex.z-dn.net/?f=%5Cfrac%7B5%7D%7B4%7Dt_%7Bi%7D)
Now,
Using the relation of time dilation, from Einstein's relation:
![t = \frac{t_{i}}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7Bt_%7Bi%7D%7D%7B%5Csqrt%7B1%20-%20%5Cfrac%7Bv%5E%7B2%7D%7D%7Bc%5E%7B2%7D%7D%7D%7D)
![\frac{5}{4}t_{i} = \frac{t_{i}}{\sqrt{1 - \frac{v^{2}}{c^{2}}}}](https://tex.z-dn.net/?f=%5Cfrac%7B5%7D%7B4%7Dt_%7Bi%7D%20%3D%20%5Cfrac%7Bt_%7Bi%7D%7D%7B%5Csqrt%7B1%20-%20%5Cfrac%7Bv%5E%7B2%7D%7D%7Bc%5E%7B2%7D%7D%7D%7D)
Squaring both sides:
![(\frac{5}{4})^{2} = (\frac{1}{\sqrt{1 - \frac{v^{2}}{c^{2}}}})^{2}](https://tex.z-dn.net/?f=%28%5Cfrac%7B5%7D%7B4%7D%29%5E%7B2%7D%20%3D%20%28%5Cfrac%7B1%7D%7B%5Csqrt%7B1%20-%20%5Cfrac%7Bv%5E%7B2%7D%7D%7Bc%5E%7B2%7D%7D%7D%7D%29%5E%7B2%7D)
![\frac{25}{16} = \frac{1}{{1 - \frac{v^{2}}{c^{2}}}}](https://tex.z-dn.net/?f=%5Cfrac%7B25%7D%7B16%7D%20%3D%20%5Cfrac%7B1%7D%7B%7B1%20-%20%5Cfrac%7Bv%5E%7B2%7D%7D%7Bc%5E%7B2%7D%7D%7D%7D)
<span>Dalton improved the atomic theory by establishing that elements are made of atoms & that all atoms of an element are identical.</span>
The correct answer is C. Electronegativity is the ability of an atom to attract electrons.
It is best illustrated as the tendency of an atom to draw a shared pair of electrons towards itself. It is affected by its atomic number and the distance of valence electrons reside from the charged nucleus.