InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Does Each And Every Incident Photon Essentially Effect An Electron ? |
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Answer» No, it MAY be observed in some other WAY. Only about 1% of incident PHOTONS EJECT ELECTRONS. No, it may be observed in some other way. Only about 1% of incident photons eject electrons. |
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| 2. |
What Is The Difference Between Thermionic Emission And Photo Electronic Emission ? |
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Answer» The THERMIONIC EMISSION is due to heat, i.e., electrons acquire energy by heat. On the other hand, in photo ELECTRIC emission, the free electrons in metals OBSERVE light photons and acquire energy. The thermionic emission is due to heat, i.e., electrons acquire energy by heat. On the other hand, in photo electric emission, the free electrons in metals observe light photons and acquire energy. |
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| 3. |
Why Is The Sunlight Not Deflected When Passed Through Either Electric Field Or Magnetic Field ? |
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Answer» The sun light does not contain any CHARGED PARTICLES. It is MADE up of electro magnetic waves HENCE it is not deflected either by electric or magnetic FIELD. The sun light does not contain any charged particles. It is made up of electro magnetic waves hence it is not deflected either by electric or magnetic field. |
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| 4. |
Explain Why A Discharge Tube Appears Dark, When Evacuated To Very Low Pressure ? |
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Answer» No discharge passes through the discharge tube as there is no carrier of charge due to very low DENSITY at that pressure no collision take place HENCE no light is emitted. As a RESULT, the discharge tube APPEARS DARK. No discharge passes through the discharge tube as there is no carrier of charge due to very low density at that pressure no collision take place hence no light is emitted. As a result, the discharge tube appears dark. |
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| 5. |
What Is A Photo Conductive Cell ? |
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Answer» It is a DEVICE WHOSE RESISTANCE DECREASES when ILLUMINATED. It is a device whose resistance decreases when illuminated. |
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| 6. |
What Is A Photo Emission Cell ? |
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Answer» It consist of a PHOTO cathode and anode mounted in an EVACUATED GLASS tube. The cathode is usually a semi - cylindrical plate while anode is a wire ring. It consist of a photo cathode and anode mounted in an evacuated glass tube. The cathode is usually a semi - cylindrical plate while anode is a wire ring. |
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| 8. |
The Phenomenon Of Emission Of Electrons By Light Is Known As? |
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Answer» Photo electric effect. |
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| 9. |
What Is Space Charge ? |
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Answer» The negatively CHARGED CLOUD of electrons NEAR the CATHODE is called space CHARGE. The negatively charged cloud of electrons near the cathode is called space charge. |
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| 10. |
What Is Vacuum Diode ? |
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Answer» It is an electrostatic device in which the SOURCE of electrons is a hot cathode and the MANIPULATION of the current is achieved through the ADJUSTMENT of potential of the cathode. It is an electrostatic device in which the source of electrons is a hot cathode and the manipulation of the current is achieved through the adjustment of potential of the cathode. |
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| 11. |
What Is Called As The Work Function Of A Metal ? |
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Answer» The work FUNCTION of METAL is the AMOUNT of energy needed by an electron to cross over the surface barrier of the metal. The work function of metal is the amount of energy needed by an electron to cross over the surface barrier of the metal. |
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| 12. |
Who First Attempted To Find The Mass Of An Electron ? |
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Answer» J.J.Thomson in 1897. J.J.Thomson in 1897. |
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| 13. |
What Is A Cathode Ray Oscilloscope ( Cro ) ? |
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Answer» It is an instrument USED for plotting ONE varying physical quantity, POTENTIAL difference, sound pressure, heart - beat against another CURRENT, displacement and time respectively. It is an instrument used for plotting one varying physical quantity, potential difference, sound pressure, heart - beat against another current, displacement and time respectively. |
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| 14. |
Which Are The Different Type Of Photo Electric Cell ? |
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Answer» PHOTO EMISSIVE CELL, PHOTOVOLTAIC cell and photo - CONDUCTIVE cell. Photo emissive cell, photovoltaic cell and photo - conductive cell. |
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| 15. |
What Is The Rest Mass Of Photon ? |
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Answer» Zero Zero |
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| 16. |
Which Device Is Used To Measure Light Intensity ? |
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Answer» Photocell. Photocell. |
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| 17. |
The Maximum Energy Of The Electrons Released In Photocell Is Independent Of ? |
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Answer» Intensity of incident light. |
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| 18. |
What Is Based Upon The Conservation Of Energy ? |
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Answer» The PHOTOELECTRIC EFFECT. The photoelectric effect. |
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| 19. |
Which Branch Of Physics Can Be Set To Have Begin With The Study Of The Conduction Of The Electricity Through Gasses ? |
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Answer» Atomic physics |
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| 20. |
What Converts Light Energy Into Electric Energy ? |
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Answer» A photo electric cell. |
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| 21. |
The Specific Charge For Cathode Rays? |
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Answer» Constant Constant |
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| 22. |
Which Is Known As Cathode Rays ? |
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Answer» The invisible RAYS coming from the CATHODE of DISCHARGE TUBE are KNOWN as cathode rays. The invisible rays coming from the cathode of discharge tube are known as cathode rays. |
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| 23. |
What Helped The Discovery Of Isotopes ? |
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Answer» The study of positive rays. |
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| 25. |
Who Was The First Scientist To Measure The Charge Of An Electron ? |
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Answer» Robert Millikan |
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| 26. |
What Is An Electron Microscope ? |
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Answer» It is an instrument that uses beam of electrons to PRODUCE magnified IMAGES of EXTREMELY small OBJECTS, beyond range of OPTICAL microscope . It is an instrument that uses beam of electrons to produce magnified images of extremely small objects, beyond range of optical microscope . |
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| 28. |
Who First Explained The Phenomena Of Photo Electric Effect ? |
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Answer» Albert Einstein |
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| 30. |
What Is Electron ? |
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Answer» SMALL, NEGATIVELY charged subatomic PARTICLE, EVERY electrically neutral atom has as many orbiting electrons as protons in nucleus. Small, negatively charged subatomic particle, every electrically neutral atom has as many orbiting electrons as protons in nucleus. |
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| 31. |
What Is Photon ? |
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Answer» It is the QUANTUM of ELECTROMAGNETIC RADIATION, such as LIGHT. It is the quantum of electromagnetic radiation, such as light. |
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