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JEE Main 20209 JanuaryMorning Shift
Exam
JEE Main
Year
2020
Date
9 January
Shift
Morning Shift
Subject
Physics
Chapter
Units and Dimensions

JEE Main 2020 · 9 January · Morning Shift · Physics · Units and Dimensions

A quantity f is given by f = h c ^ 5 G where c is speed of light, G...

A quantity ff is given by f=hc5Gf = \sqrt{\dfrac{h{c}^{5}}{G}} where cc is speed of light, GG univasal gravitational constant and hh is the Planck’s constant. Dimension of ff is that of:

Options

  1. Aarea
  2. Benergy
  3. Cmomentum
  4. Dvolume

Correct answer

B. energy

Step-by-step solution

[hc]=[MLT−23]<br/>[c]=[LT−1]<br/>[G]=[M−1L3T−2]</p><p>Substituting\left[hc\right] = \left[ML T{}^{- 2} 3\right]<br />\left[c\right] = \left[L{T}^{- 1}\right]<br />\left[G\right] = \left[{M}^{- 1}{L}^{3}{T}^{- 2}\right]</p><p>Substituting the dimensional formulas in the given formula,

\left[f\right]=[ML2T−2]= \left[M{L}^{2}{T}^{- 2}\right]

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