Chemistry Light and Energy Equations

Red light has a wavelength of 675 nm. What is its frequency?

• 2.03x10¹¹ m

• 4.44x10¹⁴ Hz

• 4.44x10¹⁴ nm

• 2.03x10¹¹ Hz

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The frequency of violet light is 7.5x10¹⁴ Hz. What is its wavelength?

• 4.0x10^-7 m

• 4.0x10⁷ m

• 2.25x10²³ m

• 2.25x10²³ Hz

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Which choice has the electromagnetic radiation in order of longest to shortest wavelength?

• x-rays, ultra-violet rays, infrared radiation, and radiowaves.

• radiowave, infrared radation, ultra-violet rays, and x-rays

• radiowave, ultra-violet rays, infrared radation, and x-rays

• x-rays, ultra-violet rays, infrared radation, and radiowave

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Which statement is true about the ground state (original energy level) and the excited state of an electron?

• The ground state is the highest energy level of an electron.

• The excited state is the lowest energy level of an electron.

• The ground state is the lowest energy level of an electron.

• When an electron goes from the ground state to an excited state it releases light energy.

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As the wavelength of light increases

• the frequency increases.
• the speed of light increases.
• the energy decreases.
• the intensity increases.

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Using the two equations E=hv and c=λv derive an equation expressing E in terms of h, c, and λ.

• E=h/cλ
• E=hc/λ
• E=hcλ
• E=h/cλ

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Which theory of light- the wave or particle theory- best explains the photoelectric effect

• wave theory
• particle theory

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Which theory of light- the wave or particle theory- best explains the emission of electromagnetic radiation by an excited atom.

• wave theory
• particle theory

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What is the speed of light?

• 3.0x10⁸ ms
• 3.0x10⁸ m/s
• 6.626x10^-34 Js
• 6.626x10^-34 J/s

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What is Planck's Constant

• 6.626x10^-34 Js
• 6.626x10^-34 J/s
• 3.0x10⁸ ms
• 3.0x10⁸ m/s

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