Derived Units
Easyphysics
1 erg equals how many joules?
Select the correct option:
Solution
Incorrect! Answer:
1×10−7J
The erg is the CGS unit of energy, where 1 erg=1 g⋅cm2⋅s−2.
- 1 g=10−3 kg
- 1 cm2=(10−2 m)2=10−4 m2 1 erg=(10−3 kg)⋅(10−4 m2)⋅s−2=10−7 Joules.
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About This Question
- Subject
- physics
- Chapter
- physics and measurement
- Topic
- derived units
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
1×10−7J
The erg is the CGS unit of energy, where 1 erg=1 g⋅cm2⋅s−2.
- 1 g=10−3 kg
- 1 cm2=(10−2 m)2=10−4 m2 1 erg=(10−3 kg)⋅(10−4 m2)⋅s−2=10−7 Joules.
This easy difficulty physics question is from the chapter physics and measurement, covering the topic of derived units. It appeared in the 2025 exam.
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