A proton and an a-particle are accelerated through a potential difference of 100 V. The ratio of the wavelength associated with the proton to that associated with an a-particle is
|
(a) |
(b) 2 : 1 |
(c) 2 |
(d) |
(c) 2
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Which of the following is coldest planet
|
(a) Mercury |
(b) Pluto |
(c) Earth |
(d) Venus |
The age of universe is believed to be
|
(a) 1 billion years |
(b) 10 billion years |
(c) 10-20 billion years |
(d) 1000 billion years |
A particle of charge q and mass m moving with a velocity v along the x-axis enters the region x > 0 with uniform magnetic field B along the 
direction. The particle will penetrate in this region in the x-direction upto a distance d equal to
|
(a) Zero |
(b) |
(c) |
(d) Infinity |
If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is
|
(a) 3 |
(b) 1.5 |
(c) 6 |
(d) |
