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PHYSICS - Trial Paper Collection

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papercollection48 X is a nuclide with nuclide notation 13 7X . Another nuclide Y has 2 protons and 3neutrons more than X. What is the nuclide notation for Y?33X ialah nuklida dengan notasi nuklida13 7X . Suatu nuklida yang lain Y mempunyai2 proton dan 3 neutron lebih daripada X. Apakah notasi nuklida bagi Y?ABCD13 9Y169Y189Y1810Y49 Diagram 33 shows a graph of activity against time for a radioactive sample.Rajah 33 menunjukkan graf aktiviti melawan masa untuk satu sampel radioaktif.Activity / counts per minuteAktiviti / pembilangan per minit120010008006004002000 5 10 15 20 25 30 35 40 Time / minutesMasa / minitDiagram 33 / Rajah 33Which statement is correct?Pernyataan yang manakah benar?ABCDThe half life is 20 minutesSeparuh hayat bahan itu ialah 20 minitAfter 30 minutes, 25% of the sample have not decayedSelepas 30 minit, 25% daripada sampel itu belum mereputAfter 45 minutes, the activity will be 100 counts per minuteSelepas 45 minit, aktiviti akan menjadi 100 pembilangan per minitThe activity will become zero after a few daysAktiviti akan berkurang ke sifar selepas beberapa hari

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