Question 1 :
The ratio of the energy of a photon of $2000 \overset{o}A$ wavelength radiation to that of $4000\overset{o}A$ radiation is:
Question 2 :
Threshold frequency of a metal is $5\times 10^{13}\ sec^{-1}$ upon which $1\times 10^{14}\ sec^{-1}$ frequency light focused then maximum kinetic energy of emitted electron?
Question 3 :
The basis of quantum mechanical model of an atom is :
Question 5 :
The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is {tex} [ a _ { 0 } {/tex} is Bohr radius].
Question 7 : De-broglie wavelength associated with a ball (mass = $132$g) moving with speed of $1000 $ m/s is: <div>$(h= 6.6\times 10^{-34}$J-s$)$</div>
Question 8 :
Which one of the following constitutes a group of the isoelectronic species?
Question 9 :
What should be the mass of the photon of sodium if its wavelength is $5894 \mathring { A }$. The velocity of light is $3\times { 10 }^{ 8 }\ { metre }/{ second }$ and the value of h is $6.6252 \times { 10 }^{ -34 } kg\ { { m }^{ 2 } }/{ s\ }?$
Question 10 :
Energy required to stop the ejection of electron from $Cu$ plate is $0.24\ eV$. If radiation of $\lambda=253.7\ nm$ strikes the plate, the work function is:
Question 11 :
The value of Planck's constant is $6.63\, \times\, 10^{- 34}$ Js. The velocity of light is $3\, \times\, 10^8$ m/sec. Which value is closest to the wavelength of a quantum of light with frequency of $8\, \times\, 10^{15}\, sec^{-1}$ ?
Question 13 :
How many times does light travel faster in vacuum than an electron in Bohr first orbit of hydrogen atom?
Question 15 :
Which person had convinced people that matter could be divided forever?<br/>
Question 16 :
In two $H$ atoms $X$ and $Y$ the electrons move around the nucleus in circular orbits of radius $r$ and $4r$ respectively. The ratio of the times taken by them to complete one revolution is :
Question 17 :
Assertion: On increasing the intensity of incident radiation, the number of photoelectros ejected and their KE increases.
Reason: Greater the intensity means greater the energy which in turn means greater the frequency of the radiation.
Question 18 :
Three different wavelengths of light $(1, 2$ and $3)$ are shined onto the same sodium metal surface. Light $1$ and $2$ produced photoelectrons while Light $3$ did not produce any photoelectrons. Light $2$ was able to produce photoelectrons with higher velocities than Light $1$.<br/>Arrange the lights in order of decreasing wavelength.
Question 19 :
An electron of mass $m$ and charge $e$, is accelerated from rest through a potential difference $V$ in vacuum. Its final speed will be:
Question 20 :
The frequency of radiation emitted when the electron falls from $n=4$ to $n=$ lina hydrogen atom will be (Given ionisation energy of $H=2.18 { 10 }^{ -18 } J\ atom ^{ -1 }$ and $h=6.625\times { 10 }^{ -34 }Js)$
Question 21 :
Which of the following relates to light both as wave motion as well as particle?
Question 22 :
Photoelectric emission is observed from a surface when lights of frequency {tex} n _ { 1 } {/tex} and {tex} n _ { 2 } {/tex} incident. If the ratio of maximum kinetic energy in two cases is {tex} K: 1 {/tex} then (Assume {tex} n _ { 1 } > n _ { 2 } {/tex} ) threshold frequency is
Question 23 :
What is likely to be orbit number for a circular orbit of diameter 20 nm of the hydrogen atom :
Question 25 :
The stopping potential doubles when the frequency of the incident light changes from $v$ to $\dfrac {3v}{2}$. Then the work function of the metal must be :<br/>
Question 26 :
The number of photons of wavelength $540 \ nm$ emitted per second by an electric bulb of power $100 W$ is: (taking $h = 6 \times 10^{-34}Js$)
Question 27 :
Ratio of energy of photon of wavelength $3000\overset{o}{A}$ and $6000\overset{o}{A}$ is : <br/>
Question 28 :
The increasing order of wavelength for $He^+$ ion, neutron(n) and electron (e) particles, moving with the same velocity is:
Question 29 :
A 1-kW radio transmitter operates at a frequency of 880 Hz. How many photons per second does it emit?
Question 30 :
Which excited state of Be<sup>3+</sup> has the same orbit radius as that of the ground state of hydrogen atom ?
Question 32 :
Atomic number and mass number of an element <b>M</b> are <b>25</b> and <b>52</b> respectively. The number of electrons, protons and neutrons in M<sup>2+</sup> ion are respectively.
Question 33 : The reaction between $\displaystyle H_{2}$ and $Br_{2}$ to form $HBr$ in presence of light is initiated by the photo decomposition of $Br_{2}$ into free $Br$ atoms (free radicals) by absorption of light. The wavelength of $Br_{2}$ is: <div>[Given : $E=1240$ eV]<br/></div>
Question 34 : Iodine molecule dissociates into atoms after absorbing light of $4500 \mathring{A}$. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms <div>[Bond energy of $I_2 = 240\ kJ\ mol^{-I}$].</div>
Question 35 :
In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen ?
Question 36 :
An {tex}\alpha{/tex}-particle has initial kinetic energy of 25 eV and it is accelerated through the potential difference of 150 volt. If a proton has initial kinetic energy of 25 eV and it is accelerated through the potential difference of 25 volt then find the approximate ratio of the final wavelengths associated with the proton and the {tex}\alpha{/tex}-particle.
Question 37 :
Threshold frequency, $v_{0}$ is the minimum frequency which a photon must possess to eject an electron from a metal. It is different for different metals. When a photon of frequency $\displaystyle 1.0\times 10^{15}S^{-1}$ was allowed to hit a metal surface, an electron having $\displaystyle 1.988\times 10^{-19}J$ of kinetic energy was emitted. The threshold frequency of this metal is:
Question 38 :
The wavelength of the radiation that would cause photo dissociation of chlorine molecule is: [$Cl-Cl$ bond energy is 241 kJ/mol]<br/>
Question 39 :
Statement 1:<br/>The wavelenght equivalent of 1eV is $1.24\times 10^{-6}$metre.<br/>and<br/>Statement 2:<br/>1 Electron volt is the energy imparted to an electron accelerated by a potential difference of 1 volt.
Question 42 : Time taken to produce 1 mol of photon by a 100 W $(Js^{-1})$ yellow lamp is:<div>(given $\lambda$ of yellow light is 560 nm)<br/></div>
Question 43 :
Which of the following is not the characteristic of x-rays ?
Question 44 :
Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying $0.5\ V$ when the radiation of $250\ nm$ is used. The work function of the metal is ...... .
Question 45 :
Light of wavelength $4000 \mathring {A}$ is incident on a metal plate whose work function is $2\ eV$. What is the maximum kinetic energy of emitted photoelectron?
Question 46 :
The energies $E_1 \ and\ E_2$ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e. $\lambda_1 \ and \ \lambda_2$ will be: <br/>
Question 47 :
In photoelectric effect, if the energy required to overcome the attractive forces on the electron (work functions) of $Li, Na$ and $Rb$ are $2.41 eV, 2.30\ eV$ and $2.09\ eV$ respectively, the work function of $'K'$ could approximately be (in $eV$):
Question 48 :
A photon of wavelength $4\times { 10 }^{ -7 } m$ strikes on metal surface. The work function of the metal is 2.13 eV. The velocity of the photo electron is:
Question 49 :
A gas absords a photon of $355\ nm$ and emits at two wavelengths. If one of the emission is at $680 nm$, then the other would be at:
Question 50 :
A certain metal when irriadiated to light(v = 3.2 $\times$ 10$^{16}$ Hz) emits photoelectrons with kinetic energy double to the of kinetic energy of photo electrons which was emitted by the same metal when irritated by light (v = 2.0 $\times$ 10$^{16}$ Hz). The v$_o$ (threshold frequency) of metal is:
Question 51 :
U.V. light of wavelength 800 A & 700 A falls on hydrogen atoms in their ground state & liberates electrons with kinetic energy 1.8eV and 4eV respectively, the Planck's constant is:<br/>
Question 52 :
A certain dye absorbs 4700 $\overset{o}A$ and fluoresces at 5080 $\overset{o}A$, these being wavelengths of maximum absorption that under given conditions 47% of the absorbed energy is emitted. The ratio of the no. of quanta emitted to the number absorbed is:<br/>
Question 53 :
In the Rutherford scattering experiment, the number of {tex} \alpha {/tex} particles scattered at an angle {tex}\theta = 60 ^ { \circ } {/tex} is 12 per min. The number of {tex} \alpha {/tex} particles per minute when scattered at an angle of {tex} 90 ^ { \circ } {/tex} are
Question 54 :
A sodium street light gives off yellow light that has a wavelength of $600$nm. Then
Question 56 :
In the emission of photoelectrons, the number of photoelectrons emitted per unit time depends upon
Question 57 :
The dissociation energy of $\displaystyle H_{2}$ is 430.53 KJ/mol. If $H_{2}$ is exposed to radiant energy of wavelength 253.7nm, what % of radiant energy will be converted into K.E?<br/>
Question 59 :
Suppose $3.1\times 10^{-18}J$ energy is needed by the interior of the human eye to see an object. How many photons of light of $\lambda=400nm$ will be needed to see the object? $h=6.6\times 10^{-34}Js$:<br/>
Question 60 :
The maximum velocity of an electron emitted by light of wavelength $\lambda$ incident on the surface of a metal of work-function $\phi$ is :
Question 61 :
A photon of $300nm$ is absorbed by a gas which then re-emits two photons. One re-emitted photon has wavelength $496nm$. Calculate wavelength of other photon re-emitted out as well as its energy.
Question 62 :
When the frequency of light incident on a metallic plate is doubled, the K.E of the emitted photoelectrons will be
Question 63 : It has been found that, when the surface of metal is irradiated with radiation of suitable frequency, electrons (photo electrons) are ejected from the surface of metal. Minimum energy required for ejection of electron from metal surface is called work function of metal.<br/><br/><div>A metallic surface is irradiated alternatively with radiations of wavelength 3000$A^{\circ}$ and 6000$A^{\circ}$. It is observed that the maximum speeds of the photoelectrons under these cases are in the ratio 3:1.<br/>Work function of the metallic surface is?</div>
Question 64 :
Light of wavelength $\lambda $ falls on a metal having work function hc/$\lambda _{0}$. The photoelectric effect will take place only if:<br/>
Question 65 :
The surface of zone material is radiated in tum . by waves of $\lambda = 350\ nm$ and $540\ nm$ respectively. The ratio of the stopping potential in the two . cases is $2 : 1$. The work function of the material is :
Question 66 :
The electrons identified by quantum numbers n and l.<br>(a). n = 4, l = 1<br>(b). n = 4, l = 0<br>(c). n = 3, l = 2 <br>(d). n = 3, l = 1.<br> They can be placed in order of increasing energy as :
Question 67 : What is atomic number Z when <img style='object-fit:contain' src='https://storage.googleapis.com/teachmint/question_assets/JEE%20Main/5e79808dadb2ea6185a75fa6' height='23' width='73' >?
Question 69 :
In a hydrogen atom , If energy of an electron ground stat is 13.6. eV , than that in the 2<sup>nd</sup> exited state is
Question 70 :
The threshould frequency of a metal 'M' is 1.5 × 10<sup>15</sup> s<sup>-1</sup>. The maximum K.E. of the photoelectrons, when the metal is irradiated with radiations of frequecny 2.5 × 10<sup>15</sup> s<sup>-1</sup>, would be -
Question 71 :
The ejection of the photoelectron from the silver metal in the photoelectric effect experiment can be stopped by applying a voltage of 0.35 V when the radiation 256.7 nm is used. Calculate the work function for silver metal.
Question 72 :
The ratio of the energy of the photon emitted by the $k_{\alpha}$ line to that of the $k_{\beta}$ line is :
