Question

The SI unit of mass is now defined in terms of
1. Boltzmann constant
2. Planck's constant
3. Gravitational constant
4. Stefan's constant​

Answer 1

Answer:

Stefan Boltzmann constant has unit of

It is the constant of proportionality in Stefan-Boltzmann law of Blackbody radiation. Stefan Boltzmann Constant is denoted by Greek letter σ.

Explanation:

Answer 2

Answer:

The SI unit of mass is now defined in terms of Plank's constant.

Option number 2 is correct choice.

Explanation:

• In classical statistical mechanics, Boltzmann Constant is used to express the equipartition of the energy of an atom. It is used to express the Boltzmann factor. It plays a major role in the statistical definition of entropy. In semiconductor physics, it is used to express thermal voltage.
• Planck's constant, symbolized as h, is a fundamental universal constant that defines the quantum nature of energy and relates the energy of a photon to its frequency. In the International System of Units (SI), the constant value is $6.62607015 \times10^{-34}$ joule-hertz−1 (or joule-seconds).
• The universal gravitational constant is the gravitational force acting between two bodies of unit mass, kept at a unit distance from each other.
• According to the Stefan-Boltzmann law, σ has a value of $5.670374419 \times10^{-8}$ watt per square meter per kelvin to the fourth (W / (m2 x K4). σ represents the constant of proportionality between these two variables.

Hence, the SI unit of mass is now defined in terms of plank's constant.

#SPJ5

Learn more about this topic on:

https://brainly.in/question/48398984