MCQ
Range of wavelength of X-rays is:
- A$10^{-4} m$ to $10^{-8} m$
- ✓$10^{-8} m$ to $10^{-13} m$
- C$10^8 m$ to $10^{13} m$
- DNone of these
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An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200-volt supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W is
|
(a) 10 Ω |
(b) 20 Ω |
(c) 50 Ω |
(d) 100 Ω |
A proton of mass m and charge +e is moving in a circular orbit in a magnetic field with energy 1 MeV. What should be the energy of α - particle (mass = 4m and charge = + 2e), so that it can revolve in the path of same radius
|
(a) 1 MeV |
(b) 4 MeV |
(c) 2 MeV |
(d) 0.5 MeV |