- AOf electron is larger than proton
- BOf proton is larger than $\alpha$−particle
- COf electron is larger than $\alpha$−particle
- DAll of the above
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Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly
|
(a) 9.61 |
(b) 4.12 |
|
(c) 1.51 |
(d) 2.13 |
The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = 6 ![]()
|
(a) 100 |
(b) 1000 |
(c) 3 |
(d) 3 |
A heavenly body is receding from earth such that the fractional change in l is 1, then its velocity is
|
(a) C |
(b) |
(c) |
(d) |
A gate has the following truth table
|
P |
1 |
1 |
0 |
0 |
|
Q |
1 |
0 |
1 |
0 |
|
R |
1 |
0 |
0 |
0 |
The gate is
|
(a) NOR |
(b) OR |
(c) NAND |
(d) AND |