- AAll the three $\alpha,\ \beta$ and $\gamma$ one after another.
- BAll the three $\alpha,\ \beta$ and $\gamma$ radiations simultaneously.
- COnly $\alpha$ and $\beta$ simultaneously.
- DOnly one $\alpha,\ \beta$ and $\gamma$ at a time.
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The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is
, the value of λ for tungsten is
|
(a) 5893 Å |
(b) 10683 Å |
(c) 2791 Å |
(d) 528 Å |
$\alpha<\beta$
$\alpha<\beta \text{ if}\text{ A}<\text{B}$
$\alpha<\beta \text{ if}\text{ A}>\text{B}$
$\alpha<\beta \text{ if}\text{ A}=\text{B}$
An electron (charge = 1.6 × 10–19 coulomb) is moving in a circle of radius 5.1 × 10–11m at a frequency of 6.8 × 1015 revolutions/sec. The equivalent current is approximately
|
(a) 5.1 |
(b) 6.8 |
(c) 1.1 |
(d) 2.2 |
A thin lens made of glass of refractive index 1.5 has a front surface + 11 D power and back surface – 6 D. If this lens is submerged in a liquid of refractive index 1.6, the resulting power of the lens is
|
(a) – 0.5 D |
(b) + 0.5 D |
(c) – 0.625 D |
(d) + 0.625 D |