IB Questionbank Physics11.Which of the following gives the correct number of protons and neutrons in a nucleus of carbon-14 ()?

ProtonsNeutronsA.86B.68C.146D.614(Total 1 mark)

2.Emission and absorption spectra provide evidence forA.the nuclear model of the atom.B.natural radioactivity.C.the existence of isotopes.D.the existence of atomic energy levels.(Total 1 mark)

3.The GeigerMarsden experiment provides evidence forA.the existence of discrete atomic energy levels.B.the existence of the neutron.C.a dense positively charged nucleus.D.the stability of some nuclei.(Total 1 mark)

4.This question is about the Rutherford model of the atom.(a)Most alpha particles used to bombard a thin gold foil pass through the foil without a significant change in direction. A few alpha particles are deviated from their original direction through angles greater than 90. Use these observations to describe the Rutherford atomic model.

............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(5)

(b)The isotope gold-197 () is stable but the isotope gold-199 () is not.(i)Outline, in terms of the forces acting between nucleons, why, for large stable nuclei such as gold-197, the number of neutrons exceeds the number of protons...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(3) (ii)A nucleus of decays to a nucleus of with the emission of an electron and another particle. State the name of this other particle.......................................................................................................................................................................................................................................................(1)(Total 9 marks)

5.The number of neutrons and the number of protons in a nucleus of an atom of the isotope of uranium are

NeutronsProtonsA.92143B.14392C.23592D.92235(Total 1 mark)

6.A photon hasA.energy and momentum.B.no energy.C.energy only.D.no momentum.(Total 1 mark)