Physics-
General
Easy
Question
A photodetector is made from a semiconductor In 
As with 
. What is the maximum wavelength, which it can detect
- 1000 nm
- 1703 nm
- 500 nm
- 173 nm
The correct answer is: 1703 nm
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GeneralGeneral
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For the structure given below the site marked as S is a :
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A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-
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chemistry-General
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What is the simplest formula of a solid whose cubic unit cell has the atom A ateach corner, the atom Bat each face centre and a Catom at the body centre-
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An equiconvex lens is cut into two halves along (i) XOX¢ and (ii) YOY¢ as shown in the figure. Let f, f ¢, f ¢¢ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively
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Choose the correct statement from the following
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A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at
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physics-General
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A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed are
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In FCC crystal, which of the following shaded planes contains the following type of arrangement of atoms
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Assertion: The value of Vander Waal constant a is higher for NH3 than for N2.
Reason: Hydrogen bonding is present in ammonia.
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Reason: Hydrogen bonding is present in ammonia.
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If 10-4 dm-3 of water is introduced into a1.0 dm-3 flask at 300K,how many moles of water are in the vapour phase when equilibrium is established? (Given : Vapour pressure of H2O at300 is3170pa;R=8.314JK 1mol)
If 10-4 dm-3 of water is introduced into a1.0 dm-3 flask at 300K,how many moles of water are in the vapour phase when equilibrium is established? (Given : Vapour pressure of H2O at300 is3170pa;R=8.314JK 1mol)
chemistry-General
