Advertisements
Advertisements
प्रश्न
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)`
Advertisements
उत्तर
v = `1/5 xx 3 xx 10^8` m/s
`lambda = h/(mv)`
= `(6.63 xx 10^(-34))/(9xx10^(-31) xx 3/5 xx 10^8)`
= `1.22 xx 10^(-11)` m
= 0.122 Å
APPEARS IN
संबंधित प्रश्न
Calculate the de Broglie wavelength of an electron moving with - of the speed of light in vacuum (Negelct relativistic effect)
(Planck's constant: h = 6.63 x 10-34 Js, Mass of electron : m = 9.11 x 10-28 g)
Plot a graph showing variation of de Broglie wavelength λ versus `1/sqrtV` , where V is accelerating potential for two particles A and B, carrying the same charge but different masses m1, m2 (m1 > m2). Which one of the two represents a particle of smaller mass and why?
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
State de Broglie hypothesis
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?
A proton and an electron have same velocity. Which one has greater de-Broglie wavelength and why?
Show on a graph the variation of the de Broglie wavelength (λ) associated with an electron, with the square root of accelerating potential (V) ?
Using de Broglie’s hypothesis, explain with the help of a suitable diagram, Bohr’s second postulate of quantization of energy levels in a hydrogen atom.
An electron is accelerated through a potential difference of 64 volts. What is the de-Broglie wavelength associated with it? To which part of the electromagnetic spectrum does this value of wavelength correspond?
Let p and E denote the linear momentum and energy of a photon. If the wavelength is decreased,
What is meant by diffraction of light?
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.
What is the kinetic energy (in eV) of the fastest electrons emitted from the surface?
Light of wavelength 2000 Å falls on a metal surface of work function 4.2 eV.
What will be the change in the energy of the emitted electrons if the intensity of light with same wavelength is doubled?
Gas exerts pressure on the walls of the container because :
Two bodies A and B having masses in the ratio of 3 : 1 possess the same kinetic energy. The ratio of linear momentum of B to A is:
When the displacement of a particle executing simple harmonic motion is half of its amplitude, the ratio of its kinetic energy to potential energy is:
A proton is accelerated through one volt the increase in its kinetic energy is approximately
The kinetic energy of electron in (electron volt) moving with the velocity of 4 × 106 m/s will be
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 de-Broglie wavelength (λ) associated with a moving electron having kinetic energy (E) is given by ______.
What is meant by “Dual nature of matter”?
