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Questions and Answers
Questions and Answers
What property of laser light makes it more hazardous than ordinary light?
What property of laser light makes it more hazardous than ordinary light?
- Directionality
- Coherence (correct)
- Monochromaticity
- Low energy deposition
What happens during absorption of a photon?
What happens during absorption of a photon?
- The photon changes direction
- The atomic system moves to a lower energy state
- The photon splits into multiple photons
- The photon disappears and the atomic system moves to an upper energy state (correct)
What is the average lifetime of an atomic system in the excited state during spontaneous emission?
What is the average lifetime of an atomic system in the excited state during spontaneous emission?
- 10–10 s
- 10–4 s
- 10–8 s (correct)
- 10–6 s
What makes laser light monochromatic?
What makes laser light monochromatic?
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What distinguishes laser light from ordinary light in terms of directionality?
What distinguishes laser light from ordinary light in terms of directionality?
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Questions and Answers
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Study Notes
Study Notes
Laser Light Properties
- Laser light is more hazardous than ordinary light due to its high intensity and ability to concentrate energy in a small area.
- The absorption of a photon causes an electron to transition from a lower energy state to a higher energy state.
Spontaneous Emission
- The average lifetime of an atomic system in the excited state during spontaneous emission is approximately 10^-8 seconds.
Monochromaticity
- Laser light is monochromatic because it is composed of a single frequency or wavelength, resulting in a single color.
Directionality
- Laser light is distinguished from ordinary light by its high directionality, which means it travels in a narrow beam with little divergence.
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