.......... happens when a wave passes from one medium to another at an angle.
- ARefraction
- BReflection
- CDispersion
- DScattering
.......... happens when a wave passes from one medium to another at an angle.
Explanation:
Refraction is a phenomenon in which when a ray passes from one medium to another it bends away from its straight-line path due to the difference in optical densities or refractive indices of the two mediums.
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Energy bands in solids are a consequence of
|
(a) Ohm’s Law |
(b) Pauli’s exclusion principle |
|
(c) Bohr’s theory |
(d) Heisenberg’s uncertainty principle |
Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface
|
(a) 4000 Å, 7500 Å |
(b) 5500 Å, 6000 Å |
(c) 4000 Å, 6000 Å |
(d) None of these |
The speed of an electron having a wavelength of
is
|
(a) 7.25 × |
(b) 6.26 × |
(c) 5.25 × |
(d) 4.24 × |
In a meter bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is
|
(a) 0.8 Ω |
(b) 0.5 Ω |
(c) 0.4 Ω |
(d) 0.25 Ω |