Ideas to Implementation
3.1 CATHODE RAYS
3.1.1 Explain that cathode ray tubes allowed the manipulation of a stream of charged particles.
DEFINITTIONS: * Cathode Ray Tube: is an evacuated tube which allows the unobstructed movement of cathode rays from a cathode to an anode. * Cathode Ray: Are negatively charged particles and can therefore be deflected. * This can be shown by 3 facts: * They leave –ve charge on the surfaces they strike * They are deflected by magnetic fields as predicted by the right hand rule. Force experienced is F=qvB. The path of deflection is circular * They are deflected by electrically charged plates (capacitor) when it is placed on the inside of the cathode ray tube. Force experienced is F=qE. The path followed is parabolic
MANIPULATIONS:
Cathode rays can be manipulated in a number of ways: 1) SPEED a. The speed the rays travel can be changed by changing the voltage between the anode and cathode. The voltage change changes the potential energy of the electrons. As it travels between the anode and the cathode, this energy is transformed into kinetic energy, therefore changing the speed of the particles. 2) NUMBER OF RAYS b. The number of cathode rays can be further manipulated by the introduction of a triode grid between the cathode and anode. Changing the voltage to this grid changes the ‘current flowing through the tube’. 3) COLLIMATOR c. This manipulates the cathode rays by only letting a single, tight beam of cathode rays through from the cathode to the anode. 4) MAGNETIC FIELDS d. Since the cathode rays are charged particles, they experience a force. e. F=qvB f. The path of deflection is circular 5) ELECTRIC FIELDS g. Since the cathode rays are charged particles, they experience a force. h. F=qE i. The path of deflection is parabolic
3.1.2 Explain why the apparent inconsistent behaviour of Cathode rays cause debate as to
3.1.1 Explain that cathode ray tubes allowed the manipulation of a stream of charged particles.
DEFINITTIONS: * Cathode Ray Tube: is an evacuated tube which allows the unobstructed movement of cathode rays from a cathode to an anode. * Cathode Ray: Are negatively charged particles and can therefore be deflected. * This can be shown by 3 facts: * They leave –ve charge on the surfaces they strike * They are deflected by magnetic fields as predicted by the right hand rule. Force experienced is F=qvB. The path of deflection is circular * They are deflected by electrically charged plates (capacitor) when it is placed on the inside of the cathode ray tube. Force experienced is F=qE. The path followed is parabolic
MANIPULATIONS:
Cathode rays can be manipulated in a number of ways: 1) SPEED a. The speed the rays travel can be changed by changing the voltage between the anode and cathode. The voltage change changes the potential energy of the electrons. As it travels between the anode and the cathode, this energy is transformed into kinetic energy, therefore changing the speed of the particles. 2) NUMBER OF RAYS b. The number of cathode rays can be further manipulated by the introduction of a triode grid between the cathode and anode. Changing the voltage to this grid changes the ‘current flowing through the tube’. 3) COLLIMATOR c. This manipulates the cathode rays by only letting a single, tight beam of cathode rays through from the cathode to the anode. 4) MAGNETIC FIELDS d. Since the cathode rays are charged particles, they experience a force. e. F=qvB f. The path of deflection is circular 5) ELECTRIC FIELDS g. Since the cathode rays are charged particles, they experience a force. h. F=qE i. The path of deflection is parabolic
3.1.2 Explain why the apparent inconsistent behaviour of Cathode rays cause debate as to