γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than
|
(a) 5.0 MeV |
(b) 4.02 MeV |
(c) 15.0 MeV |
(d) 1.02 MeV |
(d) 1.02 MeV
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In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is
|
(a) 1.0 mm |
(b) 0.1 mm |
(c) 0.05 mm |
(d) 0.01 mm |
An electric current passes through a long straight wire. At a distance 5 cm from the wire, The magnetic field is B. The field at 20 cm from the wire would be
|
(a) |
(b) |
(c) |
(d) |
A diver at a depth of 12m in water (μ = 4/3) sees the sky in a cone of semi-vertical angle
|
(a) |
(b) |
(c) |
(d) 90° |
In a triode amplifier, the value of maximum gain is equal to
|
(a) Half the amplification factor |
(b) Amplification factor |
|
(c) Twice the amplification factor |
(d) Infinity |
Atomic radius of fcc is
|
(a) |
(b) |
(c) |
(d) |
