which of the following is not a unit of energy ? 1. Nm 2. Wh 3. eV 4. Kgm∧-1s∧-2
Answers
question : which of the following is not a unit of energy.
1. Nm 2. Wh 3. eV 4. Kgm¯¹s¯²
Solution : energy is equal to work done
So, unit of energy = unit of work done
= unit of force × displacement
= Nm
So, option (1) Nm, is unit of energy.
Power = energy/time
If we take Unit of power in watt and time in hr
So, unit of energy = Wh, so option (2) Wh, is a unit of energy.
From atomic model, you learn, work done by electron = charge × potential difference
= eV
So, option (3) eV, is also unit of energy
we know, SI unit of energy is Joule, it is equal to kgm²/s² in MKS system.
but option (4) kg/(ms²) , so it is not the unit of energy.
therefore correct option is (4) kgm¯¹s¯²
Kgm⁻¹s⁻² is not unit of ENERGY
Step-by-step explanation:
Energy = work
Work Done = Force * displacement
= Nm
Hence Nm is unit of Energy
Energy = Power * Time
=> Unit of Energy = Wh
Energy = Work Done = Force * displacement
= mass * acceleration * displacement
= kg m/s² * m
= kg m²/s²
Hence Kgm⁻¹s⁻² is not unit of ENERGY
eV Electron volt is also unit of energy
It is energy gained by an electron charged particle carrying unit electronic charge when the electrical potential at the electron increases by one volt.
1 eV = 1.602 × 10⁻¹⁹joule.
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