Back to OSCILLATIONS

NEET UG PHYSICS MCQ: OSCILLATIONS

1 Easy

1 of 1

Application +4 | -1

If potential energy function for the force between two atoms in a diatomic molecule is approximately given by

U(x)=\frac{a}{x^8}-\frac{\mathrm{b}}{x^4}

, where a and

\mathrm{b}

are constants in standard SI units and

x

is in metres. Find the dissociation energy of the molecule (in

\mathrm{J}

). [Take a

=4 \mathrm{~J}

m

{ }^8

and

\mathrm{b}=20 \mathrm{~J} \mathrm{~m}^4

]

View answer and explanation

Correct option: A

25

Option A (25) is correct because the dissociation energy is calculated by finding the minimum potential energy of the molecule.

More Questions from OSCILLATIONS

Practice All Chapter MCQs →

A mass m is suspended from a spring of length l and force constant K. The frequency of vibration of the mass is

{f_1}

. The spring is cut into two equal parts and the same mass is suspended from one of the parts. The new frequency of vibration of mass is

{f_2}

. Which of the following relations between the frequencies is correct The time period of a loaded spring on earth is 6s. On the surface of moon, the time period of the same loaded spring will be. Under the action of a force

F=-k x^3

, the motion of a particle is

(k=

a positive constant

)

S-I: A particle executes SHM with frequency

f

. The frequency with which total mechanical energy of particle oscillates is

2 f

.
S-II: Both kinetic as well as potential energy of particle in SHM oscillate with a frequency

2 f.

The phase difference (in radian) between two SHM whose equations are

y_1=10 \sin \left(10 \pi t+\frac{\pi}{3}\right)

y_2=12 \sin \left(8 \pi t+\frac{\pi}{4}\right)

t=0.5 \mathrm{~s}

is: A vertical spring block system is made to oscillate.
Statement-1: Its time period on earth is more than that on the moon.
Statement-2: Its extension on earth (in equilibrium) is more than that on the moon.