Radioactivity
Akopọ
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.
Awọn Afojusun
- 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
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Radioactivity. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Radioactivity? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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