The phenomenon of radioactivity was first discovered by
Marie Curve
Sir J.J Thomson
Henn Becquerel
Niels Bohr
Enrico Fermi
Correct answer is C
No explanation has been provided for this answer.
Energy of the photons
Maximum Kinetic energy of the ejected electrons
Threshold frequency of the photons
Stopping potential of the electrons
Velocity of the electrons
Correct answer is B
No explanation has been provided for this answer.
| 24 Na → | 24 mg4 + X + energy |
|---|---|
| 11 | 2 |
Alpha particle
Beta particle
Gamma ray
X-ray
Neutron
Correct answer is B
No explanation has been provided for this answer.
84s
112s
168s
280s
616s
Correct answer is C
Heat energy = Elect. energy
mc\(\theta\) = power x time
1 x 4200 x (70 - 40) = 750 x t
t = 168s
16.00A
4.00A
0.50A
0.25A
0.06A
Correct answer is B
I\(^2\)Rt = mI;
I = \(\sqrt{\frac{mI}{Rt}}\)
= \(\sqrt{\frac{10 \times 336}{10 \times 21}}\)
= \(\sqrt{16}\)
= 4.0A