NEET UG Dual Nature of Radiation and Matter — practice questions
81 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Dual Nature of Radiation and Matter in the app →Doubling the intensity of incident light on a metal plate above threshold frequency changes:A metal has work function $2$ eV. Incident light of frequency $1\times 10^{15}$ Hz gives max KE (using $h = 4.An electron of momentum $p = 6.626\times 10^{-24}$ kg m/s has de Broglie wavelength:The Davisson-Germer experiment scattered electrons off a nickel crystal and observed:The work function $\phi_0$ of a metal is the minimum energy required for an electron to escape its surface. WhPhotoelectric emission from a metal stops below a certain frequency of incident light, called the threshold frA laser produces monochromatic light of frequency $\nu = 6.0\times 10^{14}\,\text{Hz}$. The energy carried by The work function of caesium is $\phi_0 = 2.14\,\text{eV}$. The threshold frequency for photoelectric emissionCalculate the de Broglie wavelength associated with an electron moving with a speed $v = 5.4\times 10^{6}\,\teIf the stopping potential $V_0$ is plotted on the y-axis against the frequency $\nu$ of the incident light on In a photoelectric experiment, the minimum negative potential applied to the collector plate at which the photHolding the frequency of the incident light fixed, the saturation photocurrent in a photoelectric circuit is fThe work function of caesium is $\phi_0 = 2.14\,\text{eV}$. When ultraviolet light shines on a caesium surfaceIn Einstein's photoelectric explanation, what is the fundamental interaction between light and a metal electroWhich observation does the CLASSICAL wave theory of light FAIL to explain for the photoelectric effect?Light of frequency $\nu$ shining on a metal of work function $\phi_0$ produces photoelectrons with maximum kinThe momentum carried by a photon of wavelength $\lambda$ isCalculate the de Broglie wavelength of a $150\,\text{g}$ ball travelling at $30\,\text{m\,s}^{-1}$. The resultA clean metal surface of work function $\phi_0 = 2.0\,\text{eV}$ is illuminated by monochromatic light of waveAn electron is accelerated from rest through a potential difference of $V = 120\,\text{V}$. Its de Broglie wavA monochromatic source emits light of frequency $\nu$ and total radiated power $P$. The number of photons emitIn a photoelectric experiment using a particular metal, the stopping potential is $V_{01} = 1.5\,\text{V}$ wheA photon of energy $10\,\text{eV}$ strikes a metal of work function $4\,\text{eV}$. The maximum speed acquiredA metal has threshold (cut-off) wavelength $\lambda_0 = 500\,\text{nm}$ for photoelectric emission. The work fThe specific charge (e/m) of the electron, determined by J. J. Thomson, is approximatelyMillikan's oil-drop experiment established thatThe work function φ₀ of a metal is best defined as1 electron-volt (eV) equalsWhich of these emission processes does NOT depend on a threshold frequency of incident radiation?For a given photosensitive metal, the photoelectric current at fixed frequency (above threshold) depends on thThe stopping potential V₀ at a given frequency of incident light isThe K_max of the emitted photoelectron is related to the stopping potential V₀ byMetals like Li, Na, K and Cs are photosensitive even to visible light because theyIf the frequency of incident light is doubled while the intensity is halved, the number of photoelectrons emitThe graph of stopping potential V₀ vs frequency ν of incident light for a given metal isThe threshold frequency ν₀ for a metal is related to its work function byPhotoelectric emission was discovered by Heinrich Hertz during his experiments onCathode rays were first identified byAn electron accelerated through 100 V has kinetic energy (in eV) equal toThe minimum energy needed to free an electron from a metal is its:Work function is usually measured in:Photoelectric emission was discovered in 1887 by:Below the threshold frequency, photoelectric emission:The maximum photoelectric current at high positive voltage is the:The negative voltage that just stops the current is called the:Photoelectric emission begins after a time lag that is:Who explained the photoelectric effect in 1905?In Einstein's picture, radiation travels as:The number of photoelectrons emitted per second depends on the:The kinetic energy of the photoelectrons is set by the:Increasing the intensity of light leaves the stopping potential:The work function of a surface depends on the:Who proposed that matter also has a wave nature?The waves associated with moving particles are called:The de Broglie relation contains a wave concept together with a:Ultraviolet light causing emission was studied in detail by:However intense the light, no emission occurs below the:Photoelectric current falls to zero at which voltage?The de Broglie wavelength of a fast electron is comparable with:Photoelectric emission was discovered in the year:Who discovered photoelectric emission?Hallwachs and Lenard investigated photoelectric emission during:Lenard observed photoemission when he used radiation that was:The minimum frequency below which no photoemission occurs is the:The minimum energy needed for an electron to escape a metal is the:The work function is usually measured in:One electron volt is the energy gained by an electron accelerated through:Which metal has the highest work function?Who performed the pioneering oil-drop experiment?In interaction with matter, radiation behaves as if made of:The energy of a photon is given by:The momentum of a photon is given by:A photon travels at a speed equal to that of:Increasing the intensity of light of a given wavelength increases the:Photon energy is independent of the radiation's:In a photon-particle collision, what may not be conserved?Who proposed the idea of matter waves in 1924?De Broglie was a physicist of which nationality?De Broglie was awarded the Nobel Prize in Physics in:The wave nature of electrons was confirmed by Davisson and:The de Broglie hypothesis of matter waves supports the stationary orbits of: