2. Metal : atomic structure They posses a lot of free electron on the surface as a reason of their behavioral as a conductor .
3. When metal is heated its release electrons to its surface This is known as thermionic emission Electrons, e
4. A wire is made into a coil does it has the same resistance? Coil / solenoid Explain your answer. Suggested answer: Yes if it is an insulatored wire No if it is a bare wire (not insulatored) Key word : short circuit
5. What will happen when a coil is heated? vacuum What will happen if an anode is placed in the vacuum tube as shown in the above diagram? + e e e e e
6. Fluorescent effect on screen display by several electrical appliances Cathode rays Idea of the thermionic emission
7. (c)The Mechanism of Thermionic transmission METAL consists a lot of free electrons. At room temperature these electrons cannot escape from its surface. When heated, these electrons received enough energy to be transmitted on the metal surface. The producing of charges on the surface of a metal because of the heating effect is known as thermionic transmission
20. Perubahan tenaga yang berlaku Tenaga keupayaan elektrik, E = QV Tenaga kinetik , ½ m e v e 2 Tenaga haba + cahaya Tenaga keupayaan elektrik, E = QV Tenaga kinetik , ½ m e v e 2 Tenaga haba + cahaya
21. Tiub sinar katod Tenaga keupayaan elektrik, E = QV Tenaga kinetik , ½ m e v e 2 Tenaga haba + cahaya e iaitu cas bagi satu elektron = 1.6 X 10 -19 C E = eV = ½ m e v e 2 eV = ½ m e v e 2 Prinsip keabadian tenaga
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25. 3. Rajah menunjukkan satu bayang palang Maltase pada skrin pendarflour disebabkan oleh alur-alur elektron yang pada arah masuk ke dalam kertas.Jika dua batang magnet diletakkan,ke arah manakah bayang akan beralih .