Explanation:
If proton and electron have same debroglie wavelength then momentum of electron is equals to momentum of proton.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A small lamp is hung at a height of 8 feet above the centre of a round table of diameter 16 feet. The ratio of intensities of illumination at the centre and at points on the circumference of the table will be
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 2 |
(d) 3 : 2 |
The decay constant of radium is 4.28 
per year. Its half life will be
|
(a) 2000 years |
(b) 1240 years |
(c) 63 years |
(d) 1620 years |
A substance is behaving as convex lens in air and concave in water, then its refractive index is
|
(a) Smaller than air |
(b) Greater than both air and water |
|
(c) Greater than air but less than water |
(d) Almost equal to water |
Among the following properties describing diamagnetism identify the property that is wrongly stated
|
(a) Diamagnetic material do not have permanent magnetic moment |
|
(b) Diamagnetism is explained in terms of electromagnetic induction |
|
(c) Diamagnetic materials have a small positive susceptibility |
|
(d) The magnetic moment of individual electrons neutralize each other |
Wavelength of a 1 keV photon is 
. What is the frequency of 1 MeV photon
|
(a) 1.24 |
(b) 2.4 |
(c) 1.24 |
(d) 2.4 |
A potentiometer wire has length 10 m and resistance 20Ω. A 2.5 V battery of negligible internal resistance is connected across the wire with an 80 Ω series resistance. The potential gradient on the wire will be
|
(a) 5 |
(b) 2.5 |
(c) 0.62 |
(d) 1 |
Figure shows the electric lines of force emerging from a charged body. If the electric field at A and B are 
and 
respectively and if the displacement between A and B is r then
|
(a) |
(b) |
(c) |
(d) |
