- AZero
- BInfinite
- C10-10 m
- D1010 m
Explanation:
The perpendicular distance between the path of a projectile and the center of the potential field is the impact parameter.
Therefore, for a head-on collision of the α-particle with a nucleus, the impact parameter is equal to zero.
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Two thin lenses whose powers are +2D and –4D respectively combine, then the power of combination is
|
(a) – 2D |
(b) + 2D |
(c) – 4D |
(d) + 4D |
If
is the original mass of the substance of half life period
years, then the amount of substance left after 15 years is
|
(a) |
(b) |
(c) |
(d) |
An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index
|
(a) 0.20 |
(b) 5.0 |
(c) 0.67 |
(d) 1.5 |
Field at the centre of a circular coil of radius r, through which a current I flows is
|
(a) Directly proportional to r |
(b) Inversely proportional to I |
|
(c) Directly proportional to I |
(d) Directly proportional to |
Two spheres A and B of radius ‘a’ and ‘b’ respectively are at same electric potential. The ratio of the surface charge densities of A and B is
|
(a) |
(b) |
(c) |
(d) |
Assertion : An electric bulb is first connected to a dc source and then to a ac source having the same brightness in both the cases.
Reason : The peak value of voltage for an A.C. source is
times the root mean square voltage.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |