Explanation:
The X-ray beam emerging from an X-ray tube consists of wavelengths greater than a certain minimum wavelength called cutoff wavelength.
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After five half lives what will be the fraction of initial substance
|
(a) |
(b) |
(c) |
(d) |
A straight wire carrying a current 10 A is bent into a semicircular arc of radius 5 cm. The magnitude of magnetic field at the center is
|
(a) 1.5 |
(b) 3.14 |
(c) 6.28 |
(d) 19.6 |
Electric charges q, q, -2q are placed at the corners of an equilateral triangle ABC of side l. The magnitude of electric dipole moment of the system is
|
(a) ql |
(b) 2ql |
(c) |
(d) 4ql |
In water voltameter, the electrolysis of ...... takes place
|
(a) |
(b) |
(c) |
(d) |
Consider a radioactive material of half-life 1.0 minute. If one of the nuclei decays now, the next one will decay
|
(a) After 1 minute |
|
(b) After |
|
(c) After |
|
(d) After any time |
The 
X-ray emission line of tungsten occurs at λ = 0.021 nm. The energy difference between K and L levels in this atom is about
| (a) 0.51MeV | (b) 1.2 MeV | (c) 59 KeV | (d) 13.6 eV |
