ICS Part 2 Physics Chapter 19 Short Questions Preparation


12th Class Physics
Short Questions Preparation

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Physics - ICS Part 2 Physics Chapter 19 Short Questions Preparation

Question # 1

Define Stopping potential and Threshold frequency.

  • Ans 1: Stopping potential:The stopping potential is the potential difference applied to stop the electrons from being ejected from the surface when the light fall on it.
    Threshold frequency:The minimum of frequency of incident light at which electrons are emitted from a surface is called threshold frequency.
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Prepare Complete Set Wise Questions For Chapter 8 "ICS Part 2 Physics Chapter 19 Short Questions Preparation "

ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 1

Question # 1

Define Stopping potential and Threshold frequency.

  • Ans 1: Stopping potential:The stopping potential is the potential difference applied to stop the electrons from being ejected from the surface when the light fall on it.
    Threshold frequency:The minimum of frequency of incident light at which electrons are emitted from a surface is called threshold frequency.
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ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 2

Question # 1

Which has the lower energy quanta,radio waves or x rays?Explain

  • Ans 1: Energy of quanta is given as E=hf-hc/lamda
    Radio waves length has longer wavelength,Therefore radio waves has lower energy quanta.
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ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 3

Question # 1

Can an object move with the speed of light?

  • Ans 1: As an object approaches the speed of light,its masses rises abruptly.If an object tries to travel 186,000 miles per seconds,its mass become infinite and so does the energy required to move it, For this reasons ,no normal object can be travel as fast as or faster than the speed of light.
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ICS Part 2 Physics Chapter 19 Short Questions Preparation