Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Structure of Atom question

2008 · Q108
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Chemistry
  4. /Structure of Atom
  5. /2008 · Q108

Structure of Atom question

2008 · Q108

NEETChemistryStructure of AtomMCQ+4 / −1
If uncertainty in position and momentum are equal, then uncertainty in velocity is
  1. A
    1mhπ{1 \over m}\sqrt {{h \over \pi }}m1​πh​​
  2. B
    hπ\sqrt {{h \over \pi }}πh​​
  3. C
    12mhπ{1 \over {2m}}\sqrt {{h \over \pi }}2m1​πh​​
  4. D
    h2π\sqrt {{h \over {2\pi }}}2πh​​
View written solutionFree

Correct answer: C

According to Heisenberg uncertainty principle

Δp.Δx≥h4π\Delta p.\Delta x \ge {h \over {4\pi }}Δp.Δx≥4πh​ or mΔv.Δx≥h4π\Delta v.\Delta x \ge {h \over {4\pi }}Δv.Δx≥4πh​

⇒\Rightarrow⇒ (mΔv\Delta vΔv)2 ≥h4π\ge {h \over {4\pi }}≥4πh​ (∵\because∵ Δx\Delta xΔx = Δp\Delta pΔp)

⇒\Rightarrow⇒ Δv≥\Delta v \geΔv≥ 12mhπ{1 \over {2m}}\sqrt {{h \over \pi }} 2m1​πh​​

PreviousNext

More from Structure of Atom

  • Consider the following sets of quantum numbers : Which of the following sets of quantum number is not possible ? Includes table2007 · MCQ
  • The orientation of an atomic orbital is governed by2006 · MCQ
  • Given : The mass of electron is 9.11 × 10−31 kg, Planck constant is 6.626 × 10−34 J s, the uncertainty involved in the measurement of velocity within a distance of 0.1 A∘​ is2006 · MCQ
  • The energy of second Bohr orbit of the hydrogen atom is −328 kJ mol−1; hence the energy of fourth Bohr orbit would be2005 · MCQ
  • The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in hydrogen atom will be (Given ionization energy of H = 2.18 × 10−18 J atom−1 and h = 6.625 × 10−34 J s)2004 · MCQ
  • The velocity of Planck's constant is 6.63 × 10−34 J s. The velocity of light is 3.0 × 108 m s−1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 1015 s−1 ?2003 · MCQ
  • In hydrogen atom, energy of first excited state is − 3.4 eV. Then find out K.E. of same orbit of hydrogen atom2002 · MCQ
  • Main axis of a diatomic molecule is z, molecular orbital px and py overlap to from which of the following orbitals.2001 · MCQ