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

What are black body radiations and how can you get a black body?

  • Ans 1: An objects that absorbs all radiations falling on it,at all wavelength is called a black body.
    When a body is heated ,it emits radiation its emission is called black body.
    Black body is solid that has hollow cavity within it and a small hole through which radiations can enter or escape.The inside is blackened with suit to make it as good an absorber and as a bad reflector as possible.
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ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 3

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

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