Advertisements
Advertisements
प्रश्न
An electron of energy 150 eV has wavelength of 10-10m. The wavelength of a 0.60 keV electron is?
विकल्प
0.50 Å
0.75 Å
1.2 Å
1.5 Å
Advertisements
उत्तर
0.50 Å
`λ = h/sqrt(meV)`
`λ_1 α 1/sqrt(v_1)`
`λ_2 α 1/sqrt(v_2)`
`λ_1 / λ_2 = sqrt(v_2/v_1)`
`10^-10/λ_2 = sqrt(0.60xx10^3)/150`
`= sqrt(600/150) = 2`
`10^-10/λ_2 = 10^-10/2`
`= 0.5 xx 10^-10m`
`λ_2 = 0.5À`
APPEARS IN
संबंधित प्रश्न
A proton and an α-particle are accelerated through the same potential difference. Which one of the two has less kinetic energy? Justify your answer.
A proton and an α-particle have the same de-Broglie wavelength. Determine the ratio of their accelerating potentials
An α-particle and a proton are accelerated through the same potential difference. Find the ratio of their de Broglie wavelength.
Calculate the de-Broglie wavelength of an electron moving with one-fifth of the speed of light.Neglect relativistic effects. (`h = 6.63 xx 10^(-34)` J.s, c= `3xx10^8`m/s, mass of electron = `9 xx 10^(-31) kg)`
An electron is accelerated from rest through a potential V. Obtain the expression for the de-Broglie wavelength associated with it ?
A proton and an electron have same kinetic. Which one has greater de-Broglie wavelength and why?
An electron, an alpha particle and a proton have the same kinetic energy.
Which one of these particles has the largest de-Broglie wavelength?
Consider the de-Broglie wavelength of an electron and a proton. Which wavelength is smaller if the two particles have (a) the same speed (b) the same momentum (c) the same energy?
A proton and an electron are accelerated by the same potential difference. Let λe and λpdenote the de Broglie wavelengths of the electron and the proton, respectively.
What is meant by diffraction of light?
Find the de Broglie wavelength of electrons moving with a speed of 7 × 106 ms -1.
Describe in brief what is observed when moving electrons are allowed to fall on a thin graphite film and the emergent beam falls on a fluorescent screen.
Answer the following question.
Obtain the expression for the ratio of the de-Broglie wavelengths associated with the electron orbiting in the second and third excited states of the hydrogen atom.
Light of wavelength 2000 Å falls on a metal surface of work function 4.2 eV.
If the same light falls on another surface of work function 6.5 eV, what will be the energy of emitted electrons?
Gas exerts pressure on the walls of the container because :
A litre of an ideal gas at 27°C is heated at constant pressure to 297°C. The approximate final volume of the gas is?
A particle is dropped from a height H. The de Broglie wavelength of the particle as a function of height is proportional to
A solid sphere is in a rolling motion. In rolling motion, a body possesses translational kinetic energy (kt) as well as rotational kinetic energy (kr) simultaneously. The ratio kt : kr for the sphere is:
Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular momenta will be in the ratio:
The de- Broglie wave length of an electron moving with a speed of 6.6 × 105 m/s is approximately
For production of characteristic of X-rays the electron trans mission is
Number of ejected photo electrons increase with increase
For what k.e of neutron will the associated de-Broglie wavelength be 1.40 × 10-10 m? mass of neutron= 1.675 × 10-27 kg, h = 6.63 × 10-34 J
An oil drop carrying a charge q has a mass m kg it is falling freely in air with terminal speed v. the electron field required to make the drop move upward with the same speed is
The work function of a metal is 4.50 eV. Find the frequency of light to be used to eject electrons from the metal surface with a maximum kinetic energy of 6.06 × 10−19 J.
What is meant by “Dual nature of matter”?
