Or
diamond
μ
water
= 1.80
Thus, C is the correct answer option.
Question 15
What is the Joule equivalent of 1 eV? (Charge on electron = 1.6 x 10
-19
C)
A. 1.6 x 10
-19
J
B. 3.2 x 10
-19
J
C. 3.2 x 10
-13
J
D. 1.6 x 10
-13
J
E. 1 J
Correct Answer: A
Explanation:
Joule is the SI unit of energy. eV is also a unit of energy but for microscopic charged particles. One
electron volt (eV)is defined as the energy possessed by an electron moving in a unit potential field.
We know that energy of a charged particle in a potential field is given as
E = q V J ------------- (1)
For an electronin a potential field of 1 V,energy can be expressed by using equation 1 as
E = e V J ------------- (2)
Putting the value in equation 2 we get
1 ev = 1.6 x 10
-19
* 1 J
Or 1 ev = 1.6 x 10
-19
J
Therefore, A is the correct answer option.