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Consider a microscopic spring鈥搈ass system whose spring stiffness is50N/m, and the mass is410-26kg. (a) What is the smallest amount of vibrational energy that can be added to this system? (b) What is the difference in mass (if any) of the microscopic oscillator between being in the ground state and being in the first excited state? (c) In a collection of these microscopic oscillators, the temperature is high enough that the ground state and the first three excited states are occupied. What are possible energies of photons emitted by these oscillators?

Short Answer

Expert verified

a) 3.7110-21J

b) 4.110-38kg

c) 3.7110-21J,7.4210-21and11.1310-21J

Step by step solution

01

Identification of the given data

The given data can be listed below as-

  • The spring stiffness of the microscopic spring-mass system is 50N/m.
  • The mass of the spring is410-26kg.
02

Significance of the Planck’s law and the mass-energy equivalence

The Planck鈥檚 law states that the energy emitted is directly proportional to the product of the Planck鈥檚 constant and the frequency.

The mass-energy equivalence states that the energy emitted is equal to the mass of an object and the square of the light鈥檚 speed.

The Planck鈥檚 equation gives the vibrational energy and the mass energy equivalence gives the difference in the mass and the possible photon energies.

03

Determination of the smallest vibrational energy

According to the Planck鈥檚 law, the smallest vibrational energy is expressed as-

E=h0

Here, E=The smallest amount of vibrational energy

h= The Planck鈥檚 constant鈥檚

0=The angular frequency of the spring mass system

The above equation can also be written as-

E=h2.km

Here, h=Absolute value of the Planck鈥檚 constant

k=The spring stiffness

m=Mass of the spring

Forrole="math" localid="1657799146287" h=6.62610-34Js,k=50N/mand410-26kg,

E=6.62610-34Js23.14.50N/m410-26kg=1.0510-34Js.3.531013s-1(N/kgm=N/Ns)(1Ns=1kgm)=3.7110-21J

Thus, the smallest amount of vibrational energy that can be added to this system is 3.7110-21J.

04

Determination of the difference in mass of the microscopic oscillator

According to the mass-energy equivalence, the equation of the energy of the microscopic oscillator is expressed as-

E=mc2

Here,E= Energy of the microscopic oscillator

m=Mass difference of the microscopic oscillator

c=The speed of light

For andE=3.7110-21Jandc=3108m/s2. ,

3.7110-21J=m(3108m/s)2 m=3.7110-21J(3108m/s)2=4.110-38Js2/m2kgm2/s2=4.110-38kg

Thus, the difference in mass between being in the ground and the first exited state is 4.110-38kg.

05

Determination of the possible energies of photon

As the energy levels are at equal distance, then there are mainly three possible energies of photon.

According to the Planck鈥檚 law, the equation of the energy of the photon at the ground state is expressed as-

E1=NE

Here,E1the energy of the photon at the ground state

N=The number of the state

E=The energy level

For N=1andE=3.7110-21J

E=13.7110-21J=3.7110-21J

According to the Planck鈥檚 law, the equation of the energy of the photon at the first exited state is expressed as-

E2=NE

Here, E2=the energy of the photon at the first exited state

N=The number of the state

E=The energy level

ForN=2andE=3.7110-21J.

E1=23.7110-21J=7.4210-21J

According to the Planck鈥檚 law, the equation of the energy of the photon at the second excited state is expressed as-

E2=NE

Here,E2=the energy of the photon at the second excited state

N=The number of the state

E=The energy level

For N=3andE=3.7110-21J

E=33.7110-21J=11.1310-21J

Thus, the possible energies of photons emitted by these oscillators are3.7110-21J , 7.4210-21Jand11.1310-21J respectively.

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Most popular questions from this chapter

A hot bar of iron glows a dull red. Using our simple ball-spring model of a solid (Figure 8.23), answer the following questions,explaining in detail the processes involved. You will need to make some rough estimates of atomic properties based on prior work. (a) What is the approximate energy of the lowest-energy spectral emission line? Give a numerical value. (b) What is the approximate energy of the highest-energy spectral emission line? Give a numerical value. (c) What is the quantum number of the highest-energy occupied state? (d) Predict the energies of two other lines in the emission spectrum of the glowing iron bar. (Note: Our simple model is too simple-the actual spectrum is more complicated. However, this simple analysis gets at some important aspects of the phenomenon.)

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