A moving H-atom makes a head on perfectly inelastic collision with a stationary `Li^(++)` ion. Just before collision, both `- H` and `Li^(++)` are in their first excited state. Immediately after collision H was found to be in ground state and `Li^(++)` was in its second excited state. Find the kinetic energy of H – atom before collision. No photon is emitted in the process. Assume that mass of `Li^(++)` is nearly 7 times the mass of H.
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If a projectile explods in mid air then just before and just after explosion, choose correct option(s)
Gravity is non impulsive hence momentum conservation is valid. Centre of mass do not change original part because before and after explosion net force mg on system is same. Energy...
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A free hydrogen atom in its ground state is at rest. A neutron having kinetic energy `k_(0)` collides head one with the atom. Assume that mass of both
Correct Answer - (a) `20.4 eV` , (b) `8.72 eV` or `4.19 eV`
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Supply of a product is perfectly price-inelastic. Its demand 'decreases'. This leads to fall in real national income. Other things remaining unchange.
Real national income measures GDP in real terms or only in terms of goods and services and not the prices. When the supply is perfectly inelastic, with a fall in...
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if letters of the word MATHEMATICS are arranged then the probability that C come before E,E before H ,H before I and I before S
Correct Answer - C `(c )` The total number of arrangments is `(11!)/(2!2!2!)=(11!)/(8)` The number of arrangements in which `CE,H,I,S` appear in that order `"^(11)C_(5)(6!)/(2!2!2!)=(11!)/(8*5!)` `:.` Required Proability `=((11!)/(8*5!))/((11!)/(8))=(1)/(120)`
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The minimum kinetic energy of a ground state hydrogen atom required to have head-on collision with another ground state hydrogen atom but at rest to p
Correct Answer - 20.4 eV
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Define perfectly inelastic collision. Give an example of it.
1. Collision in which the colliding bodies stick together after collision and move with a common velocity is called perfectly inelastic collision. 2. The loss in kinetic energy is maximum in...
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Two bodies undergo one-dimensional, perfectly inelastic, head-on collision. Derive an expression for the loss in the kinetic energy.
USE 1) IF ELASTIC COLLISION THEN ENERGY CONSERVATION K.E.(INITIAL)=K.E.(FINAL) 2) IN INELASTIC USE MOMENTUM CONSERVATION
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20. A coconut of mass \( 2 Kg \) is falling from a coconut free of height \( 10 m \). Find the potential energy, kinetic energy and total energy at the following points. \( \left( g =10 m / s ^{2}\right) \) a) Before falling from the coconut tree. b) Just before hilting the ground. c) At a height \( 4 m \) from the ground. d) Which law is evident from this example?
(a) Given m = 2 kg h = 10 m Potential energy at before falling from the coconut tree. u = mgh u = 2 x 10 x 10 u = 200 joule Kinetic energy will...
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Two coins are tossed simultaneously. Find the probability of getting (i) exactly 1 head (ii) at most 1 head (iii) at least 1 head.
Correct Answer - (i) ` 1/2 (ii) 3/4 (iii) 3/4 `
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Two bodies A and B of masses 1 kg and 2 kg moving towards each other with velocities 4 m/s and 1 m/s suffers a head on collision
Correct option is: (A) move in direction of motion of lighter mass.
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