- AAn electron
- BA proton
- CAn α−particle
- DA dust particle
Explanation:
A dust particle will it be most difficult to experimentally verify the de-Broglie relationship.
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A coil of wire of resistance 50Ω is embedded in a block of ice. If a potential difference of 210 V is applied across the coil, the amount of ice melted per second will be
|
(a) 4.12 gm |
(b) 4.12 kg |
(c) 3.68 kg |
(d) 2.625 gm |
The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is
|
(a) 200 cm |
(b) 160 cm |
(c) 2.5 cm |
(d) 0.1 cm |
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is
|
(a) + 80 cm |
(b) – 80 cm |
(c) – 24 cm |
(d) –100 cm |
There is a uniform electric field of strength along y-axis. A body of mass 1g and charge
is projected into the field from origin along the positive x-axis with a velocity 10m/s. Its speed in m/s after 10s is (Neglect gravitation)
|
(a) 10 |
(b) 5 |
(c) 10 |
(d) 20 |
'Mirage' is a phenomenon due to
|
(a) Reflection of light |
(b) Refraction of light |
|
(c) Total internal reflection of light |
(d) Diffraction of light |