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Chapter 1: Problem 83

Which physical quantity has unit of joule - second? (a) velocity (b) plank's constant (c) energy (d) viscosity

Short Answer

Expert verified
The physical quantity with the unit Joule-second (Js) is (b) Planck's constant.

Step by step solution

01

Understand the given options

First, let us familiarize ourselves with the four physical quantities provided as options: (a) Velocity: The rate of change of an object's position with time. (b) Planck's constant: A fundamental constant in quantum mechanics, connecting the energy of a photon to its frequency. (c) Energy: The capacity of an object to do work or the amount of work done by a force. (d) Viscosity: A measure of a fluid's resistance to flow or deformation.
02

Determine the units of each physical quantity

Next, let us examine the units of each of these physical quantities: (a) Velocity: The unit of velocity is meter per second (m/s), as it indicates the distance covered per unit time. (b) Planck's constant: The unit of Planck's constant is Joule-second (Js), which relates the energy of a photon to its frequency. (c) Energy: The unit of Energy is Joule (J), which is the amount of work done by a force. (d) Viscosity: The unit of viscosity is Pascal-second (Pa·s), which expresses the fluid's resistance to flow or deformation.
03

Identify the physical quantity with the unit Joule-second

Based on our analysis of the units for each physical quantity, we can now determine which one has the unit Joule-second (Js). From our analysis in step 2, we found that the unit of Planck's constant is Joule-second (Js). Therefore, the correct answer to the question is: (b) Planck's constant

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