- AThomas Young
- BMax planck
- CJames Clerk Maxwell
- DAlbert Einstein
Explanation:
In 1864, Maxwell predicted the existence of electromagnetic waves, the existence of which had not been confirmed before that time, and out of his prediction came the concept of light being a wave, or more specifically, a type of electromagnetic wave. It is a wide intuition that Albert Einstein proposed the dual nature theory but is not correct.
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Work function of lithium and copper are respectively 2.3 eV and 4.0 eV. Which one of the metal will be useful for the photoelectric cell working with visible light ? (h = 6.6 × 10–34 J-s, c = 3 × 108 m/s)
|
(a) Lithium |
(b) Copper |
(c) Both |
(d) None of these |
The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is
|
(a) 0.168 eV |
(b) 16.8 eV |
(c) 1.68 eV |
(d) 2.5 eV |
The equivalent resistance between the points P and Q of the circuit given is
|
(a) |
(b) |
(c) 4 R |
(d) 2 R |
The condition for a uniform spherical mass m of radius r to be a black hole is [G = gravitational constant and g = acceleration due to gravity]
|
(a) |
(b) |
(c) |
(d) |
At neutral temperature, the thermoelectric power
has the value
|
(a) Zero |
(b) Maximum but negative |
|
(c) Maximum but positive |
(d) Minimum but positive |