- AZero rest mass and zero spin
- BZero rest mass and half integral spin
- CZero rest mass and spin of unity
- DUnit rest mass and spin of unity
Explanation:
Rest mass of photon is zero because it is just a form of energy.
Spin of a photon is 1.
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A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by (Given Planck constant h = 6.6
J - sec)
|
(a) 1.05 |
(b) 3.16 |
(c) 2.11 |
(d) 4.22 |
In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is
|
(a) 2.2 k W |
(b) 3.3 k W |
(c) 5.6 k W |
(d) 9.1 k W |
In the given figure, when galvanometer shows no deflection, the current (in ampere) flowing through 5Ω resistance will be
|
(a) 0.5 |
(b) 0.6 |
(c) 0.9 |
(d) 1.5 |
Three identical capacitors are given a charge Q each and they are then allowed to discharge through resistance R1, R2 and R3. Their charges, as a function of time shown in the graph below. The smallest of the three resistance is
|
(a) R3 |
(b) R2 |
(c) R1 |
(d) Cannot be predicted |
Sum of the two binary numbers and
is
|
(a) |
(b) |
(c) |
(d) |
A radioactive sample at any instant has its disintegration rate 5000 disintegration per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is
|
(a) 0.8 In 2 |
(b) 0.4 In 2 |
(c) 0.2 In 2 |
(d) 0.1 In 2 |