An electron, an alpha-particle, and a proton have the same kinetic energy. Which of these particles has the shortest de Broglie wavelength?
(d) Cannot say
The stopping potential (V0) depends on
(a) the frequency of incident light
(b) the nature of the emitter material.
(c) for a given frequency of incident light, it is independent of its intensity
(d) all of the above
In Davison- German experiment, an electron beam is incident on a crystal. The reflected beam consists of
What is the de Broglie wavelength of an electron accelerated through a Potential difference of V volts
(a) λ = 1.227/V nm
(b) λ = 1.227/V nm
(c) λ = 1.227√V nm
An electron and proton have the same de-Broglie wavelength. Then K.E. of the electron is
(c) equal to K.E. of the proton
(d) greater than K.E. of proton
Photoelectric effect shows
(a) wave nature of electrons
(b) particle nature of light
(c) both (a) &(b)
(d) none of these
A photocell is a device which
(a) converts light into electricity
(b) converts electricity into light
(c) stores light
(d) stores electricity
The dimension of work function is ----
(b) [ML2 T–1]
(c) [ML 2 T–3A–1]
If the kinetic energy of the particle is increased by 16 times, the percentage change in the de-Broglie wavelength of the particle is
The de-Broglie wavelength of an electron in the 1st Bohr orbit is
(a) equal to the circumference of the 1st orbit
(b) equal to twice the circumference of the 1st orbit
(c) equal to half the circumference of the 1st orbit
(d) equal to one-fourth the circumference of the two orbit
The maximum kinetic energy of a photoelectron is 3 eV. What is the stopping potential?
Why are alkali metals most suited for photoelectric emission?
Find the de-Broglie wavelengths of (a) a 46-g golf ball with a velocity of 30 m/s and (b) an electron with a velocity of 107 m/s.
The work function of caesium is 2.14 eV. Find (a) the threshold frequency for caesium, and (b) the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60 V.
A nucleus of mass M initially at rest splits into two fragments of masses and . Find the ratio of de-Broglie wavelength of the two fragments.
What is the de Broglie wavelength associated with an electron, accelerated through a potential difference of 100 volts?
Estimate the ratio of the wavelengths associated with the electron orbiting around the nucleus in the ground and first excited states of a hydrogen atom.
Two monochromatic beams A and B of equal intensity l hit a screen. The number of photons hitting the screen by beam A is twice that by beam B. Then what inference can you make about their frequencies?
Find the de-Broglie wavelength of neutron at 27o C. Given the Boltzmann constant 1.38× 10-23 Jmolecule-1k-1, h = 6.63× 10-34Js , mass of neutron 1.66× 10-23 kg.
A proton and an alpha particle, both initially at rest, are (suitably) accelerated so as to have the same kinetic energy. What is the ration of their de-Broglie wavelengths?