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13. oscillations — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics13. oscillations1 Mark
MCQ
In an elevator, a spring clock of time period $T_S$ (mass attached to a spring) and a pendulum clock of time period $T_P$ are kept. If the elevator accelerates upwards
  • A
    $T_S$ well as $T_P$ increases
  • B
    $T_S$ remain same, $T_P$ increases
  • ✓
    $T_S$ remains same, $T_P$ decreases
  • D
    $T_S$ as well as $T_P$ decreases
✓

Answer

Correct option: C.
$T_S$ remains same, $T_P$ decreases
c
$T_{s}=2 \pi \sqrt{\frac{m}{k}} T_{s}$ doesn't depend on $g .$

$T_{p}=2 \pi \sqrt{\frac{\ell}{g}} ; \quad T_{p} \propto g^{-1 / 2}$

$\therefore T_{p}$ decreases

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