Quantum Theory of Light

what is black body?

• idealised body that absorb light only

• Idealised body that absorb electromagnetic radiation that falls on it.

• Emit electromagnetic which determined by temperature

• All of the above

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What is the correct effect if the wavelength is short

• Frequency high

• Frequency low

• Energy low

• Energy high

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What is black body radiator?

• A body that radiates heat

• reflect the light

• Emit electromagnetic radiation

• determine a temperature

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An object will emit radiation if…

• The object have temperature

• The object have bright colour

• The object is hot only

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What is true thermal radiation?

• Electromagnetic radiation

• Cannot be seen by human eye

• Visible light only

• Can be seen by human eye

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Which of them states about the quantum theory

• Isaac Newton

• Albert Einstein

• Thomas Young

• Max plank

• Zarith

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What is quantum of energy?

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Calculate the photon energy for the wavelength 400nm

• 2.65 x 10-19J

• 4.97 x 10-19J

• 4.97 x 10-20 J

• 4.87 x10-19J

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Presence of wave properties of electrons was confirmed through experiment of…

• All below

• Light reflection

• Electron refraction

• Electron diffraction

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Do all particle exhibit wave characteristics?

• Yes

• No

• Yes but small mass particle only

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