Related InterviewSolutions

• Highly energetic electrons are bombarded on a target of an element containing `30` neutrons. The ratio of radii of nucleus to that of Helium nucleus is `141//3`. The atomic number of nucleus will be.A. 25B. 26C. 56D. 30
• Assertion : Isobars are the element having same mass number but different atomic number. Reason : Neutrons and protons are present inside nucleusA. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false.
• A nucleus `._ZX^A` emits `9 alpha-`particles and `5p` particle. The ratio of total protons and neutrons in the final nucleus is.A. `(Z - 13)/((A - Z - 23))`B. `((Z - 18))/((A - 36))`C. `((Z - 13))/((A - 36))`D. `((Z - 13))/((A - Z - 13))`
• The fission of `.^235 U` can be triggered by the absorption of a slow neutrons by a nucleus. Similarly a slow protons can also be used. This statement is.A. CorrectB. WrongC. Information is insufficientD. None of these
• `.^90 Sr` from the radioactive fall out from nuclear bomb ends up in the bones of human being through the milk consumed by them. It causes impairment of the production of res blood cells. The energetics `beta-`particles emitted in the decay of `.^90 Sr` damage the bone marrow.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false.
• The time of revolution of an electron around a nucleus of charge `Ze` in `n`th Bohr orbit is directly proportional toA. nB. `(n^(3))/(Z^(2))`C. `(n^(2))/(Z)`D. `(Z)/(n)`
• Assertion : Neutrons penetrate matter more readily as compared to protons. Reason : Neutrons are slightly more massive than protonsA. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false.
• Radioactive nuclei emit `beta^-1` particles. Electrons exist inside the nucleus.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false.
• Assertion: Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Reason: According to classical physical all moving electrons radiate.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If the assertion and reason both are false.
• Hydrogen atom excites energy level from fundamental state to `n = 3`. Number of spectrum lines according to Bohr, isA. 4B. 3C. 1D. 2