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ChapterSevenReview

# ChapterSevenReview - 2300 Chapter 7 Review E=h c= and...

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2300 Chapter 7 Review ΔE=hν, c=λν, and possible variations. 1. What is the wavelength (in nanometers) of light having a frequency of 8.6 × 10 13 Hz? A) 3.5 nm B) 3.5 × 10 3 nm C) 3.5 × 10 6 nm D) 2.9 × 10 5 nm 2. What is the frequency (in Hz) of light having a wavelength of 566 nm. 3. What is the frequency of light having a wavelength of 456 nm? 4. What is the wavelength (in nanometers) of radiation having a frequency of 2.45 × 10 9 Hz? (This is the type of radiation used in microwave ovens.) 5. The average distance between Mars and Earth is about 1.3 × 10 8 miles. How long would it take TV pictures transmitted from the Viking space vehicle on Mars' surface to reach Earth? (1 mile = 1.61 km.) A) 0.70 s B) 7.0 × 10 2 s C) 2.7 × 10 3 s D) 1.0 × 10 5 s 6. How many seconds would it take a radio wave to travel from the planet Venus to Earth? (Average distance from Venus to Earth = 28 million miles.) A) 1.5 × 10 2 s B) 9.3 × 10 1 s C) 9.3 s D) 0.15 s 7. The SI unit of time is the second, which is defined as 9,192,631,770 cycles of radiation associated with a certain emission process in the cesium atom. Calculate the wavelength of this radiation (to three significant figures). In which region of the electromagnetic spectrum is this wavelength found? 8. The SI unit of length is the meter, which is defined as the length equal to 1,650,763.73 wavelengths of the light emitted by a particular energy transition in krypton atoms. Calculate the frequency of the light to three significant figures.

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9. A photon has a wavelength of 624 nm. Calculate the energy of the photon in joules. 10. The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 × 10 14 Hz. Calculate the wavelength, in nm, associated with this radiation. A) 2.5 × 10 –3 nm B) 4.0 × 10 2 nm C) 4.5 × 10 2 nm D) 4.8 × 10 2 nm 11. A photon has a frequency of 6.0 × 10 4 Hz. Calculate the energy (in joules) of this photon.
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