MCQ
In beta decay, the typical Q value is approximately:
- A2 MeV
- B1 MeV
- C1 eV
- D10 MeV
Explanation:
The Q value for a reaction is the amount of energy released by that reaction.
In beta decay, a typical Q is around 1 MeV.
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Red light is used as danger signal because it is:
An object is placed first at infinity and then at 20 cm from the object side focal plane of the convex lens. The two images thus formed are 5 cm apart. The focal length of the lens is
|
(a) 5 cm |
(b) 10 cm |
(c) 15 cm |
(d) 20 cm |
A parallel plate capacitor having a plate separation of 2 mm is charged by connecting it to a 300 V supply. The energy density is
|
(a) 0.01 J/m3 |
(b) 0.1 J/m3 |
(c) 1.0 J/m3 |
(d) 10 J/m3 |