In reality, the fish are in the ocean.
I’m pretty sure it’s D. variable
Answer:
The potential difference through which an electron accelerates to produce x rays is
.
Explanation:
It is given that,
Wavelength of the x -rays, 
The energy of the x- rays is given by :

The energy of an electron in terms of potential difference is given by :

So,

V is the potential difference
e is the charge on electron


V = 12431.25 volts
or

So, the potential difference through which an electron accelerates to produce x rays is
. hence, this is the required solution.
Word for a tiny piece of matter that cannot be divided is B - Atom