Concept explainers
Interpretation:
The
Concept introduction:
Light is measured by its wavelength (in nanometres) or frequency (in Hertz).
One wavelength equals the distance between two successive wave crests or troughs.
Frequency (Hertz) equals the number of waves that passes a given point per second.
The relation between the
Here,
The frequency of
The energy of the photon is directly proportional to frequency.
Here,
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Student Study Guide for Chemistry
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- The lasers used in supermarket scanners emit red light at a wavelength of 633 nm. Compact disc players use lasers that emit light (that is not visible) at 840 nm. Which photonsthose emitted by supermarket scanners or compact disc (CD) playerscontain more energy per photon? Supermarket scanners CD players They both contain the same amount of energy per photon.arrow_forwardThe energy of a photon is 2.70 1019 J. What is the wavelength of the corresponding light? What is the color of this light?arrow_forward6.17 The laser in most supermarket barcode scanners operates at a wavelength of 632.8 nm. What is the energy of a single photon emitted by such a laser? What is the energy of one mole of these photons?arrow_forward
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