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Q. What is Fraunhofer diffraction?
a) The source as well as the screen are at infinite distances from the obstacle producing diffraction.
b) The wave front suffer diffraction is plane.
c) The diffracted rays that are parallel to one another are brought to focus with the help of a convex lens.
1.A=the set of whole numbers less tan 4 ? 2.B=the set of prime numbers less than 19 ? 3.C=the set of first three days of week?
how
Cathode rays are made up of: (1) Positively charged particles (2) Negatively charged particles (3) Neutral particles (4) None of these Ans: (2)Negatively charged pa
why metallic frame used in searles apparatus
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Sample of ethane gas (molar mass & 30.1 g/mol) occupies 1.2 x 10 -2 m3 at 46°C and 2.4 x 105 Pa. How many moles of ethane are present in the sample? What is the mass of the
A horizontal power line carries a current of 6110 A from south to north. Earth's magnetic field (86.8 mT) is directed toward the north and is inclined downward at 70 degrees to the
In mechanics, stress is a measure of the internal forces acting within a deformable body. Quantitatively, it is a measure of the average force per unit area of a surface within the
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Silver Symbol Ag Atomic weight 107.868 Atomic number 47 discovery
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