Why length, mass and time are chosen as base quantities in mechanics ?
Why length, mass and time are chosen as base quantities in mechanics ?
Because,
$(i)$ Length, mass and time cannot be derived from any other quantities.
$(ii)$ All other quantities in mechanics can be derived in terms of length, mass and time.
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A physical quantity is measured and its value is found to be $nu$ where $n = $ numerical value and $u = $ unit. Then which of the following relations is true
A physical quantity is measured and its value is found to be $nu$ where $n = $ numerical value and $u = $ unit. Then which of the following relations is true
Match List$-I$ with List$-II$.
List$-I$
List$-II$
$(a)$ ${R}_{{H}}$ (Rydberg constant)
$(i)$ ${kg} {m}^{-1} {s}^{-1}$
$(b)$ $h$ (Planck's constant)
$(ii)$ ${kg} {m}^{2} {s}^{-1}$
$(c)$ $\mu_{{B}}$ (Magnetic field energy density)
$(iii)$ ${m}^{-1}$
$(d)$ $\eta$ (coefficient of viscocity)
$(iv)$ ${kg} {m}^{-1} {s}^{-2}$
Choose the most appropriate answer from the options given below:
Match List$-I$ with List$-II$.
| List$-I$ | List$-II$ |
| $(a)$ ${R}_{{H}}$ (Rydberg constant) | $(i)$ ${kg} {m}^{-1} {s}^{-1}$ |
| $(b)$ $h$ (Planck's constant) | $(ii)$ ${kg} {m}^{2} {s}^{-1}$ |
| $(c)$ $\mu_{{B}}$ (Magnetic field energy density) | $(iii)$ ${m}^{-1}$ |
| $(d)$ $\eta$ (coefficient of viscocity) | $(iv)$ ${kg} {m}^{-1} {s}^{-2}$ |
Choose the most appropriate answer from the options given below:
- [JEE MAIN 2021]
How many wavelength of $K{r^{86}}$ are there in one metre
How many wavelength of $K{r^{86}}$ are there in one metre