An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength λ. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be
|
(a) λ |
(b) λ |
(c) λ |
(d) λ |
(b) λ
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The mass defect per nucleon is called
|
(a) Binding energy |
(b) Packing fraction |
(c) Ionisation energy |
(d) Excitation energy |
$\sqrt{\frac{\text{GM}}{4\text{R}}}$
$\sqrt{\frac{\text{RM}}{2\text{R}}}$
$\sqrt{\frac{\text{GM}}{\text{R}}}$
$\sqrt{\frac{2\text{GM}}{\text{R}}}$
The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then
|
(a) After deviation it will emerge from the second refracting surface |
|
(b) It is totally reflected on the second surface and emerges out perpendicularly from third surface in air |
|
(c) It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface |
|
(d) It is totally reflected from all the three sides of prism and never emerges out |
In transformer, core is made of soft iron to reduce
|
(a) Hysteresis losses |
(b) Eddy current losses |
|
(c) Force opposing electric current |
(d) None of the above |
X-rays are produced by accelerating electrons by voltage V and let they strike a metal of atomic number Z. The highest frequency of X-rays produced is proportional to
|
(a) V |
(b) Z |
(c) (Z – 1) |
(d) |
A convex lens forms a real image of an object for its two different positions on a screen. If height of the image in both the cases be 8 cm and 2 cm, then height of the object is
|
(a) 16 cm |
(b) 8 cm |
(c) 4 cm |
(d) 2 cm |
