MCQ
Which two physical quantities have same units?
- AWork function and threshold frequency
- ✓Planck's constant and angular momentum
- CWork function and stopping potential
- DPlanck's constant and angular velocity
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A nucleus of atomic mass A and atomic number Z emits β - particles. The atomic mass and atomic number of the resulting nucleus are
|
(a) A, Z |
(b) A + 1, Z |
(c) A, Z + 1 |
(d) A – 4, Z - 2 |
If an electron jumps from 1st orbital to 3rd orbital, then it will
|
(a) Absorb energy |
(b) Release energy |
|
(c) No gain of energy |
(d) None of these |
In the disintegration series
The value of Z and A respectively will be
|
(a) 92, 236 |
(b) 88, 230 |
(c) 90, 234 |
(d) 91, 234 |
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
|
(a) Sky wave |
(b) Ground wave |
(c) Sea wave |
(d) Both (a) and (b) |