Friday, February 12, 2010
HomeWork For Today
Posted on 7:14 PM by Mohamed Omar
1): Choose the correct answer:
2): Explain each of the following:
4): Give reasons of the following:
- The scientist who supposed that matter composed of 4 constituents (Thomson – Aristotle – Rutherford – Dalton)
- The 1st scientist who defined the element was (Boyle – Rutherford- Bohr- Thomson)
- The strong evidence that proved that cathode rays exist in all matters is (they have thermal effect – they flow in straight lines – they consist of fine particles – they have the same behaviors whatever the gas or the cathode material used)
- The scientist who named the cathode rays by electrons in 1897 and concluded that they are produced from the decomposition of the gas inside the discharge tube is (Thomson – Aristotle – Rutherford – Dalton)
2): Explain each of the following:
- Dalton’s atomic model
- How the cathode rays may be obtained
- Thomson's atomic model
4): Give reasons of the following:
- To get the cathode ray, the tube discharged to very low pressure and connected to high potential difference
- Atoms is electrically neutral
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