Chapter Unit - 6 : Modern Physics - Thermionic Emission and Cathode Ray Tube - Frank Solutions for Class 10 Physics ICSE
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Chapter 6 - Modern Physics - Thermionic Emission and Cathode Ray Tube Excercise 271
(i) Work function of the material.
(ii)Melting point of the material.
So pressure inside cathode ray tube should be kept very low.
(i) Electron gun : arrangement of electrodes where a stream of electrons is produced is known as electron gun
(ii)Deflection system: Stream of emerging electrons is deflected in its passage between the gun and the screen. This deflection is produced by two pairs of parallel plates arranged at right angles.
(iii)Fluorescent screen: At the end of the tube screen is coated with a mixture of fluorescent material and phosphorescent material. The phosphorescent material is responsible for the persistence of the image on the screen.
(i) A hotter filament is used,
(ii) The anode voltage is increased?
(ii)If anode voltage is increased then this would collimate the beam into a narrower, faster stream of electrons, producing a smaller, sharper dot on the screen.
(ii) Cathode ray tubes are used by doctors for converting electrical impulses corresponding to heart beats into visual signals in ECG, EEG etc.
In presence of electric field, beam of electrons experience a force and deflected towards the positive plate. The path is parabolic within the electric field and after electric field the beam of electron travels straight.
In presence of magnetic field, the electrons experience a force, the direction of which is given by Fleming left hand rule. The beam of electrons gets deflected and follows a circular path. The magnetic field is perpendicular to the plane of paper inwards and is represented X. On emergence from the magnetic field, they travel along a straight path in opposite direction to their velocity.
Chapter - Excercise
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