Energy Light Planck's Constant

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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Now, practice entering the number for the value of the Speed of Light: [Type your answer as NUMBERx10^exp, without spaces or units]

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What is the value of Planck's Constant?

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A blue light has a wavelength of 4x10^-7 m. What is its frequency, to one decimal place?

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When an electric stove glows red, it is producing near-IR light, of wavelength about 7.9x10^-7 m. What is its frequency to 3 decimal places?

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A blacklight that makes neon things glow in the dark has a wavelength of about 3.15x10^-7 m. What is its frequency? (2 decimal places please!)

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Below are the answers to the previous 3 questions. Which one has the MOST energy?

• 9.52x10^14

• 3.797x10^14 Hz

• 7.5x10^14

• They are all the same

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A radio station that Mrs. Gladstone likes is 97.5 WWWV out of Charlottesville. The station number means that the frequency of the radio wave is 97.5 Megahertz, or 9.75x10^5 Hz. What is the wavelength? (Use the Hz value and report it to 2 decimal places please!)

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If you have satellite TV, a radio-type wave comes to your house from space at a frequency of 12.2 GHz, which is 12.2x10^9 Hz. Choose the best answer for the wavelength!

• 0 m

• 0.0246 m

• 2.46x10^7 m

• 40.67 m

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A soda bottle is about 13 inches tall, or 3.3x10^-1 m. An electromagnetic wave of the same wavelength would be what type of wave?

• Radio wave

• Micro wave

• Visible light

• X-ray

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