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Questions and Answers
What is the SI unit for mass?
What is the SI unit for mass?
- kilogram (correct)
- pound
- meter
- Coulomb
What is the velocity of an object moving 80 m in 5 seconds?
What is the velocity of an object moving 80 m in 5 seconds?
- 95 m/s
- 56 m/s
- 24 m/s
- 16 m/s (correct)
On which day did Roentgen first discover x-radiation?
On which day did Roentgen first discover x-radiation?
- November 8, 1895
- December 28, 1895 (correct)
- August 5, 1898
- March 14, 1904
Which term refers to a phosphor's ability to emit visible light when stimulated by energy?
Which term refers to a phosphor's ability to emit visible light when stimulated by energy?
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Which of the following is a cardinal rule of radiation protection?
Which of the following is a cardinal rule of radiation protection?
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Which derived unit is the product of mass and acceleration of an object?
Which derived unit is the product of mass and acceleration of an object?
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Study Notes
Units and Measurements
- The SI unit for mass is the kilogram (kg).
Motion and Velocity
- The velocity of an object moving 80 m in 5 seconds is 16 m/s (calculated by dividing distance by time).
X-Radiation
- Wilhelm Conrad Röntgen first discovered x-radiation on November 8, 1895.
Phosphors
- The term that refers to a phosphor's ability to emit visible light when stimulated by energy is luminescence.
Radiation Protection
- One of the cardinal rules of radiation protection is "as low as reasonably achievable" (ALARA), which aims to minimize exposure to radiation.
Derived Units
- The derived unit that is the product of mass and acceleration of an object is force, measured in newtons (N).
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