Problem: When a photon is emitted from an atom, the atom recoils. The kinetic energy of recoil and the energy of the photon come from the difference in energies between the states involved in the transistion. Suppose, a hydro ...

Radium(Atomic no. 87 and mass no.221) is a radioactive substance having half life of 4 days.Find the probability that a nucleus undergoes decay after two half lives. A.1 B.1/2 C.3/4 D.1/4 ...

Radium(Atomic no. 87 and mass no.221) is a radioactive substance having half life of 4 days.Find the probability that a nucleus undergoes decay after two half lives. A.1 B.1/2 C.3/4 D.1/4 ...

Nuclei of radioactive element A are produced at rate t2 at any time t.The element A has decay constant Î».Let N be the number of nuclei of element A at any time t.At tinme t=t0 , dN/dt is minimum.Then find the number of nucle ...

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multi correct; in non uniform spherical shell of mass 'm' and radius R (here E is gravitational intensity) which of the following are wrong; (A) E = 0 (r<R) (B) âˆ« E.dS = 0 on any closed surface inside the shell (C) E can ...

a square loop PQRS of side 'L' is placed near an infinite current( i ) carrying wire in the same plane at a distance 'L'. now the loop is rotated about side PS by 90Â° . find the charge which passes through any point of the l ...

in a hypothetical atom, potential energy beteen electron and proton at distance 'r' is given by ( -ke2/4r3 ) where k is constant . suppose bohr model is valid and n is principal quatum number , then total energy is proportion ...