Page 07 9. A student makes the following statements about sub-nuclear particles. I The force mediating particles are bosons. II Gluons are the mediating particles of the strong force. III Photons are the mediating particles of the electromagnetic force. Which of these statements is/are correct? A I only B II only C I and II only D II and III only E I, II and III 10. The last two changes in a radioactive decay series are shown below. A Bismuth nucleus emits a beta particle and its product, a Polonium nucleus, emits an alpha particle. ȕ Į ⎯⎯⎯→ ⎯⎯⎯→ P R 208 Q S 82 decay decay Bi Po Pb Which numbers are represented by P, Q, R and S? P Q R S A 210 83 208 81 B 210 83 210 84 C 211 85 207 86 D 212 83 212 84 E 212 85 212 84 [Turn over