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The isotopes "Co^57 decays by electron...

The isotopes ` "_Co^57 ` decays by electrons capture to `"^57Fe` with a half - life 272d. The ` "^57Fe` nucleus is produced in an excited state, and it almost instantaneously emits gamma rays. If the activity of a radiation source ` "^57Co`is 2.0 `muCi` now, how many ` "_Co^57` nuclei does the sorce contains?

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The isotopes ^57Co decays by electrons capture to "^57Fe with a half - life pf 272d. The "^57Fe nucleus is produced in an excited state, and it almost instantaneously emits gamma rays. What will be the activity after one year?

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CHETANA PUBLICATION-Structure of atoms and nuclei-EXERCISE
  1. The isotopes "Co^57 decays by electrons capture to "^57Fe with a hal...

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  2. The radius of 3rd Bohr's orbit in hydrogen atom is 4.782 xx 10^-10 m C...

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  3. Find the ratio of the diameters of 1st Bohr orbit to 3rd Bohr orbit.

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  4. Calculate the linear velocity and angular momentum of an electron in t...

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  5. Angular speed of the electron in the 1st Bohr orbit is 4.08 xx10^16 ra...

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  6. Find the period of revolution of electron in the second orbit in the h...

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  7. The angular momentum of the electron in the second Bohr orbit is 2.112...

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  8. Find the energy of the electron in eV in the third Bohr orbit of the h...

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  9. Energy of an electron in the first Bohr orbit is -13.6eV. Hence calcul...

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  10. What is rolling kinetic energy ?

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  11. Calculate the difference in energies of two levels between which a tra...

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  12. An electron in the ground state jumps to 4th state by absorption of en...

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  13. Calculate the wavelength of a microwave of frequency 8 GHz

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  14. The Ha line of the Balmer series of hydrogen spectrumhasa wavelength 6...

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  15. Calculate the energy radiated by the electron in the hydrogen atom dur...

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  16. Find the series limit of Paschen series R = 1.097 xx 10^7 m^1.

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  17. Find the ratio of the longest wavelength to the shortest wavelength in...

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  18. If the shortest wavelength in Paschen series is 8203 A^@, find the lon...

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  19. John Dalton's model of atom was

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  20. Bohr's theory applicable to

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  21. If the radius of 1st Bohr orbit in hydrogen atom is 0.5 A^@ 'then radi...

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