Radioactivity
Muhtasari
Radioactivity is the spontaneous emission of radiation from unstable atomic nuclei. It underpins everything from medical imaging and cancer treatment to smoke detectors and carbon dating.
In this lesson you will learn about atomic structure, isotopes, the three types of nuclear radiation (alpha, beta and gamma), how to balance nuclear equations, half-life calculations, uses and dangers of radiation, and the difference between contamination and irradiation.
Malengo
- Describe the structure of an atom in terms of protons, neutrons and electrons and use standard notation 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
- Describe the effects on the atomic and mass numbers of a nucleus of the emission of each of the four main types of radiation
- Understand how to balance nuclear equations in terms of mass and charge
- Know that photographic film or a Geiger-Muller detector can detect ionising radiations
- Explain the sources of background (ionising) radiation from Earth and space
- Know that the activity of a radioactive source decreases over a period of time and is measured in becquerels
- Know the definition of the term half-life and understand that it is different for different radioactive isotopes
- Use the concept of half-life to carry out simple calculations on activity, including graphical methods
- Describe uses of radioactivity in industry and medicine
- Describe the difference between contamination and irradiation
- Describe the dangers of ionising radiations, including mutations, cell damage and radioactive waste disposal
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Radioactivity. 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.
- Alpha particles are stopped by: A) Concrete B) Aluminium C) Paper D) Nothing Answer: C
- In beta decay, the atomic number: A) Decreases by 2 B) Stays the same C) Increases by 1 D) Decreases by 1 Answer: C
- The most ionising radiation is: A) Alpha B) Beta C) Gamma D) X-rays Answer: A
- Half-life is the time for: A) All atoms to decay B) Activity to reach zero C) Activity to halve D) Temperature to halve Answer: C
- Contamination differs from irradiation because: A) It involves gamma only B) Radioactive material is on/in the body C) It does not involve radiation D) It stops when the source is removed Answer: B
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Radioactivity? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
