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A piece of wood shows a C-14 activity which is 60% of the activity found today. The age of the sample is (t1/2 for C-14 is 5770 years) ...
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Wooden artifact and a freshly cut down tree give 7.6 and 15.2 counts min-1 g-1 of carbon respectively. The age of the artifact is(t1/2=5600 years) ...
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Loss of β-particle is equivalent to ...
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An isotope of X239 can be converted to X235 by the emission of ...
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In the nuclear reaction 92U235→82Pb207, the number of α & β particles lost would be ...
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The loss of α particle results in ...
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Which of the following represents isobars? ...
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Which of the following pairs represents isotopes? ...
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Radioactive decay is ...
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In Frenkel defect ...
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Silicon doped with arsenic is ...
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F-centers in an ionic crystal are ...
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The density of crystal increases because of ...
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In Schottky defect ...
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The packing fraction in hcp is ...
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The radii of tetrahedral voids in terms of radii of packing spheres (R) is ...
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The packing fraction in ccp is ...
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The packing fraction in bcc is ...
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A compound contains A & B elements. Atoms A are in ccp arrangement while B occupy two-third octahedral voids. Formula of the compound is ...
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A compound contains A & B elements. Atoms A are in ccp arrangement while B occupy all tetrahedral voids. Formula of the compound is ...
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A substance crystallizes in a face-centered cubic(fcc) lattice in which atoms "A" occupy each corner of the cube and atoms "B"occupy the face-centres of the cube. The simplest formula of the substance is ...
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cubic close packing tallies with ...
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The total no. of identical spheres required in cubic close packing arrangement of a unit cell is ...
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A ball hits a wall and returns with the same velocity. What was teh impulse acting? ...
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First thing to note: Dont get Overwhelmed. Just take the test easily. This is one of the easier concepts in physics which students tend to fear uselessly. Q) An impulse acts on a static ball and changes its velocity by 20m/s. ...
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A man is stuck at the center of a frictionless skating pool. Which of these will take him to the end? i) Starting to skate using the skates he is wearing ii) Throwing his one glove away iii) Catching a punk hit by another ...
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A man 50 kg in mass uses a gun, 10kg in mass. He shoots a bird from a boat which is 90kg. The bird is 100g. The bullet is 10g. If the speed of the boat after shooting the bullet was 0.1m/s. What was the speed with which the b ...
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An explosion in mid air of a hand grenade traveling at a velocity of 10i+5j+10k into 3 pieces of mass 100g, 200g and 200g respectively. Video sensors detected that the first mass had velocity 13j+10k soon after explosion. The ...
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3 jelly balls of equal masses travelling at velocities 2i+3j, 2j+3k, i+j collide in mid air and magically become one. What is teh velocity of this larger jelly ball? ...
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the co-ordination no. of Ca2+ & F- in the CaF2 structure is ...