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Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 6 - Modern Physics - Thermionic Emission and Cathode Ray Tube

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Frank Textbook Solutions Chapter Unit - 6 - Modern Physics - Thermionic Emission and Cathode Ray Tube

Frank Textbook Solutions are considered extremely helpful for solving difficult questions in the ICSE Class 10 Physics exam. TopperLearning Textbook Solutions are compiled by our subject experts. Herein, you can find all the answers to the questions of   Chapter Unit - 6 - Modern Physics - Thermionic Emission and Cathode Ray Tube for the Frank textbook.

Frank Textbook Solutions for class 10 are in accordance with the latest ICSE syllabus, and they are amended from time to time to be most relevant. Our free Frank Textbook Solutions for ICSE Class 10 Physics will give you deeper insight on the chapters and will help you to score more marks in the final examination. ICSE Class 10 students can refer to our solutions while doing their homework and while preparing for the exam.

 

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Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 6 - Modern Physics - Thermionic Emission and Cathode Ray Tube Page/Excercise 271

Solution 1

The minimum amount of energy required to emit electrons from a metal surface is called work function of that material.

Solution 2

The electrons in the outer orbits are weakly attracted by the nucleus and are loosely bound. When a solid is formed, the loosely bound electrons leave their individual atom and become a part of the solid as a whole. They are called conduction electrons.

Solution 3

when certain metals are heated to a high temperature, they emit thermions (electrons) and the phenomenon is called thermionic emission. Thermionic emission can be used to produce cathode rays oscilloscope.

Solution 4

Rate of emission of electrons from a heated surface depends upon:
(i)  Work function of the material.
(ii)Melting point of the material.

Solution 5

Materials of low work function are preferred as electron emitters because they emit electrons even at a low temperature.

Solution 6

Work function of a material is generally expressed in electron volt (eV).
1 eV = 1.6 10-19 J.

Solution 7


(i)Electrons are the charged particles.
(ii)Amount of charge on each particle is 1.6 10-19 J.
(iii)Approximately 3000 V of voltage is applied to heat the filament.
(iv)Potential difference V1 applied between the anode and filament is few hundred volts.
(v)Beam of electrons gets deflected when it passes through the magnetic field.

Solution 8

Pressure inside a cathode ray tube should be kept very low because cathode rays are made up of electrons and mass of electrons are very low. If air exists inside the cathode ray tube then electrons would be deflected by air molecules and cathode would not be able to strike on screen properly.
So pressure inside cathode ray tube should be kept very low.

Solution 9

A layer of graphite is made on the inner side of the cathode ray tube close to the fluorescent screen. As a result of impacting electrons, the screen acquires a negative charge. To reduce this effect, the graphite is electrically connected to 'earth' (zero volts).This allows excess charge to drain away. Otherwise the accumulated charge would reduce the numbers of electrons arriving at the screen, reducing brightness.

Solution 10

Brightness of the pattern on the screen of CRT can be controlled by varying the potential applied to the cathode.

Solution 11

Cathode ray tube has three main sections

(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.

Solution 12

(i)If hotter filament is used then no of electron would increase and a brightness of the spot on the screen would increase.
(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.

Solution 13

(i) Cathode ray tubes are used in science research laboratories by scientist for converting electrical signals into visual signals and television tubes.
(ii) Cathode ray tubes are used by doctors for converting electrical impulses corresponding to heart beats into visual signals in ECG, EEG etc.

Solution 14

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. While fluorescence material coated inside screen is responsible for production of bright spot on the screen when electron beam strikes on the screen.

Solution 15


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.

Frank Modern Certificate Physics - Part II Class 10 Chapter Solutions

TopperLearning provides step-by-step solutions for each question in each chapter in the Frank textbook recommended by ICSE schools. Access Chapter Unit - 6 - Modern Physics - Thermionic Emission and Cathode Ray Tube here. Our Frank Textbook Solutions for ICSE Class 10 Physics are designed by our subject matter experts. These solutions will help you to revise the whole chapter, so you can clear your fundamentals before the examination.

Text Book Solutions

ICSE X - Physics

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