QUANTUM THEORY OF LIGHT

Which of the following electromagnetic waves has the highest frequency?

• Gamma rays

• UV rays

• Visible light

• Radio waves

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Which of the following electromagnetics waves has the longest wavelength?

• Gamma rays

• UV rays

• Microwaves

• Radio waves

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What is the range of wavelength for the visible light?

• 400 - 750 cm

• 400 - 750 mm

• 400 - 750 nm

• 400 - 750 km

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A black body is ............................

• an idealised body that is able to reflect all electromagnetic radiation that falls on it.

• an idealised body that is able to absorb all electromagnetic radiation that falls on it.

• an idealised body that is able to refract all electromagnetic radiation that falls on it.

• an idealised body that is able to diffract all electromagnetic radiation that falls on it.

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All scientists below proposed classical theory of light except...

• Isaac Newton

• Thomas Young

• Albert Einstein

• J.J. Thomson

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All scientists below proposed quantum theory of light except...

• Max Planck

• John Dalton

• Louis de Broglie

• Niels Bohr

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Calculate the energy of a 750 nm light photons.

Given: E = hf, c = fƛ, h = 6.63 × 10^–34 Js, c = 3.00 × 10⁸ ms^–1

• 1.65 × 10^{–19 J}

• 2.65 × 10^{–19 J}

• 3.65 × 10^{–19 J}

• 4.65 × 10^{–19 J}

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A 50 W lamp emits red light with a wavelength,

ƛ = 7.0 × 10^–7m. What is the number of photons emitted per second?

Given:

P = nhc/ƛ , h = 6.63 × 10^–34 Js, c = 3.00 × 10⁸ m s^–1

• 1.76 × 10²⁰ s^–1

• 2.76 × 10²⁰ s^–1

• 3.76 × 10²⁰ s^–1

• 4.76 × 10²⁰ s^–1

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A red laser pen emits light with a wavelength of 670 nm. If the number of photons emitted is 3.37 × 10¹⁸ per second, what is the output power of the laser pen?

Given:

P = nhc/ƛ , h = 6.63 × 10^–34 Js, c = 3.00 × 10⁸ m s^–1

• 1.00 W

• 2.00 W

• 3.00 W

• 4.00 W

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Name a phenomenon that shows the wave properties of electrons.

• Reflection

• Refraction

• Dispersion

• Propagation

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