Physics: Radioactivity And Particles: Units
Muhtasari
Radioactivity is invisible, silent and completely beyond the reach of your senses. The only way to say anything useful about a radioactive source is to attach numbers to it, and numbers in physics are worthless without the right units.
This short lesson covers the handful of units you need for the whole radioactivity topic: the becquerel for activity, the centimetre for the distances and thicknesses used in absorption experiments, and the second, minute and hour for the times that appear in half-life questions. You will also practise the conversions that examiners build into calculation questions.
Malengo
- Use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min) and second (s)
Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Physics: Radioactivity And Particles: Units. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- The becquerel is the unit of: A) Half-life B) Activity C) Absorbed dose D) Count rate in a detector Answer: B
- An activity of 1 Bq means: A) One decay per minute B) One decay per hour C) One decay per second D) One thousand decays per second Answer: C
- A source has an activity of 2.5 kBq. In becquerels this is: A) 25 Bq B) 250 Bq C) 2500 Bq D) 25000 Bq Answer: C
- A detector records 600 counts in 5 minutes. The count rate in counts per second is: A) 2 counts per second B) 120 counts per second C) 12 counts per second D) 0.5 counts per second Answer: A
- An absorber is 6 mm thick. In centimetres this is: A) 0.06 cm B) 0.6 cm C) 6 cm D) 60 cm Answer: B
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Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
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Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
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