Explanation

Wavelength is a measure of distance between two wave crests or troughs.

The SI unit for measuring distance is the meter (m), hence it is used for wavelength.

It is typically denoted by the symbol λ (lambda).

Explanation

The standard unit for angular velocity is radians per second (rad/s).

Dimensional formula Angular velocity is [T]⁻¹

The SI unit of velocity is a ms^-1 and m/s.

Explanation

The coulomb, also written as its abbreviation 'C', is the SI unit for electric charge.

One coulomb is equal to the amount of charge from a current of one ampere flowing for one second.

One coulomb is equal to the charge on 6.241 x 1018 protons.

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Explanation

Deca (symbol: da) is the SI prefix that represents a factor of 10.

It is used to denote ten times the base unit, such as 1 decameter = 10 meters.

Explanation

 joule is a scalar quantity.

SI base units: kg⋅m2⋅s−2

Symbol: J

joule, a unit of work or energy in the International System of Units (SI)

Explanation

Power of a Lens= 1/focal length

Explanation

Permittivity (ε) quantifies how much the electric field is reduced within a medium.  

Its SI unit is Farad per meter (F/m).

Explanation

Angular momentum (L) = Moment of inertia (I) × Angular velocity (ω)  

- Moment of inertia unit = kg·m²  

- Angular velocity unit = rad/s (radian is dimensionless)  

→ So, unit of angular momentum = kg·m²/s

Explanation

The kilowatt-hour (kWh) is a unit of energy commonly used to measure electricity consumption.

It represents the amount of energy used when a device with a power rating of 1 kilowatt operates for 1 hour. 

Additional information 

Energy/Work: Measured in joules (J).

Charge: Measured in coulombs (C).

Pressure: Measured in pascals (Pa).

Electric current: Measured in amperes (A).

Electric resistance: Measured in ohms (Ω).

Temperature: Measured in kelvin (K).

Torque: Measured in newton metres (N m).

Velocity: Measured in meters per second (m/s).

Acceleration: Measured in meters per second squared (m/s²).

Explanation

Lactometer is used for milk

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A lactometer is an instrument that is used to check for the purity of milk by measuring its density.

 lactometer works on the principle of gravity of milk.