Physics · May / June 2023 · Paper 41 · Question 9
0625
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Fig. 9.1 represents all the particles in a neutral atom of a radioactive isotope X1. Fig. 9.1 (not to scale)
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9(a)[2]
(number of neutrons =) 7
any one from:
number of electrons = number of protonswhite dots are protons / there are 5 protonsgrey dots are neutrons(number of neutrons) = 12 – 59(b)(i)[2]
(X2 has) one more proton more and one fewer neutron (than X1) OR (X2 has) 6 protons and 6 neutrons
(X2 has) one neutron fewer / one more proton (than X1)
OR (X2 has) 6 protons / 6 neutrons
9(b)(ii)[1]
(X2) has fewer (excess) neutrons (in its nucleus) ORA
9(c)(i)[2]
time (taken)
for number of (radioactive) nuclei / atoms (in a sample of X1) to halve OR for rate of decay to halve
9(c)(ii)[1]
large number of particles produced in short time OR high / large decay rate OR high dose (of radiation) in short time
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