Radioactivity
Bayani Gaba-gaba
Some nuclei are simply not stable. Left completely alone, with nothing done to them at all, they break apart and fling out particles or energy at enormous speed. Nobody can predict which nucleus will go next, yet the behaviour of a whole sample is so regular that doctors, engineers and archaeologists build careers on it.
This lesson takes you from the structure of the nucleus to the three ionising radiations, their penetrating power, the meaning of half-life, and the real uses and real dangers of radioactive materials. Expect calculation questions on half-life and explanation questions on safety in your Edexcel papers.
Manufura
- Describe the structure of an atom in terms of protons, neutrons and electrons and use symbols to describe particular nuclei
- Know the terms atomic (proton) number, mass (nucleon) number and isotope
- Know that alpha particles, beta particles and gamma rays are ionising radiations emitted from unstable nuclei in a random process
- Describe the nature of alpha particles, beta particles and gamma rays, and recall that they may be distinguished in terms of penetrating power and ability to ionise
- Investigate the penetration powers of different types of radiation using either radioactive sources or simulations
- Explain the sources of background (ionising) radiation from Earth and space
- Know the definition of the term half-life and understand that it is different for different radioactive isotopes
- Describe uses of radioactivity in industry and medicine
- Describe the difference between contamination and irradiation
- Describe the dangers of ionising radiations, including that radiation can cause mutations in living organisms, that radiation can damage cells and tissue, and the problems arising from the disposal of radioactive waste and how the associated risks can be reduced
Takardar Darasi
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Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Nazarin Darasi
Barka da kammala darasi akan Radioactivity. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.
Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.
Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.
- Which radiation is stopped by a single sheet of paper? A) Alpha B) Beta C) Gamma D) All three Answer: A
- Which radiation is the most penetrating? A) Alpha B) Beta C) Gamma D) They are all equal Answer: C
- A nucleus is written with mass number 40 and atomic number 19. How many neutrons does it contain? A) 19 B) 21 C) 40 D) 59 Answer: B
- A source has an activity of 1600 Bq and a half-life of 10 minutes. What is its activity after 30 minutes? A) 800 Bq B) 400 Bq C) 200 Bq D) 100 Bq Answer: C
- Which of the following is the largest natural contributor to background radiation in many countries? A) Nuclear power stations B) Radon gas from rocks C) Mobile phone masts D) Weapons fallout Answer: B
Akwai a cikin manhajar Green Bridge
Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Akwai a cikin manhajar Green Bridge
Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Littattafan da ake ba da shawarar karantawa
Yi Aikin Tambayoyin Gwaji
Kana son yin aikin tambayoyin gwaji kan Radioactivity? Sauke manhajar Green Bridge CBT don samun tambayoyin gwaji da cikakkun jarrabawa akan wannan batu.
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Duk abin da kake buƙata don yin fice a JAMB, WAEC & NECO.
