UP Board Class 12 Dual Nature of Radiation and Matter — practice questions
24 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice UP Board Class 12 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 f