Which of the following statements is true?
- AThe range for weak nuclear force is shortest among all four forces
- BThe range for electromagnetic force is smaller than that for gravitation force
- CThe relative strength of gravitational force is higher than that for weak nuclear force
- DThe relative strength for weak nuclear force is larger than that for strong nuclear force
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The dimensions of pressure are equal to
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View SolutionIdentify the incorrect statement among the following.
Some physical quantities are given in Column $I$ and some possible $SI$ units in which these quantities may be expressed are given in Column $II$. Match the physical quantities in Column $I$ with the units in Column $II$.
Column $I$ Column $II$ $(A)$ $GM_e M_s$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$M_s$: mass of the Sun) $(p)$ $(\text{volt})(\text{coulomb})(\text{metre})$ $(B)$ $\frac{3RT}{M}$ ($R$: universal gas constant,$T$: absolute temperature,$M$: molar mass) $(q)$ $(\text{kg})(\text{m})^3(\text{s})^{-2}$ $(C)$ $\frac{F^2}{q^2 B^2}$ ($F$: force,$q$: charge,$B$: magnetic field) $(r)$ $(\text{m})^2(\text{s})^{-2}$ $(D)$ $\frac{GM_e}{R_e}$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$R_e$: radius of the earth) $(s)$ $(\text{farad})(\text{volt})^2(\text{kg})^{-1}$
| Column $I$ | Column $II$ |
| $(A)$ $GM_e M_s$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$M_s$: mass of the Sun) | $(p)$ $(\text{volt})(\text{coulomb})(\text{metre})$ |
| $(B)$ $\frac{3RT}{M}$ ($R$: universal gas constant,$T$: absolute temperature,$M$: molar mass) | $(q)$ $(\text{kg})(\text{m})^3(\text{s})^{-2}$ |
| $(C)$ $\frac{F^2}{q^2 B^2}$ ($F$: force,$q$: charge,$B$: magnetic field) | $(r)$ $(\text{m})^2(\text{s})^{-2}$ |
| $(D)$ $\frac{GM_e}{R_e}$ ($G$: universal gravitational constant,$M_e$: mass of the earth,$R_e$: radius of the earth) | $(s)$ $(\text{farad})(\text{volt})^2(\text{kg})^{-1}$ |
If $\epsilon_0$,$E$,and $t$ represent the free space permittivity,electric field,and time respectively,then the unit of $\frac{\epsilon_0 E}{t}$ will be:
The unit of length convenient on the atomic scale is known as an $\mathring{A}$ and is denoted by $\mathring{A}: 1 \mathring{A} = 10^{-10} \, m$. The size of a hydrogen atom is about $0.5 \mathring{A}$. What is the total atomic volume in $m^{3}$ of a mole of hydrogen atoms?
Medium
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