Explanation:
Propagation of de Broglie waves in 1d real part of the complex amplitude is blue, imaginary part is green. The probability (shown as the colour opacity) of finding the particle at a given point x is spread out like a waveform, there is no definite position of the particle.
As the amplitude increases above zero the curvature decreases, so the amplitude decreases again, and vice versa the result is an alternating amplitude: a wave. So, the matter waves are waves of probability amplitude.
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Half lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the sample of A and B have equal number of nuclei. After 80 minutes, the ratio of remaining number of A and B nuclei is
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(a) 1 : 16 |
(b) 4 : 1 |
(c) 1 : 4 |
(d) 1 : 1 |
Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.
The fact that the conductance of some metals rises to infinity at some temperature below a few Kelvin is called
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(a) Thermal conductivity |
(b) Optical conductivity |
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(c) Magnetic conductivity |
(d) Superconductivity |
The energy of hydrogen atom in its ground state is – 13.6 eV. The energy of the level corresponding to the quantum number n is equal 5 is
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(a) – 5.40 eV |
(b) – 2.72 eV |
(c) – 0.85 eV |
(d) – 0.54 eV |
The photoelectric threshold wavelength for potassium (work function being 2eV ) is
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(a) 310 nm |
(b) 620 nm |
(c) 1200 nm |
(d) 2100 nm |
At a certain place, the horizontal component 
and the vertical component 
of the earth's magnetic field are equal in magnitude. The total intensity at the place will be
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(a)
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(b) 
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(c) 
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(d) 
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The armature of dc motor has 20Ω resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be
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(a) 150 V |
(b) 170 V |
(c) 180 V |
(d) 190 V |
Which of the following statement is true
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(a) Velocity of light is constant in all media |
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(b) Velocity of light in vacuum is maximum
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(c) Velocity of light is same in all reference frames |
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(d) Laws of nature have identical form in all reference frames |