List of top Physics Questions on Photoelectric Effect

Radiation of wavelength \(331\ \text{nm}\) irradiates the following metals :
Which of the following statements is correct ?
While studying photoelectric emission from a given surface, the wavelength of the incident radiation is changed from \(600\,\text{nm}\) to \(400\,\text{nm}\), keeping the intensity of radiation the same. Then :
Assertion (A) : Photoelectric current depends upon the intensity of the incident radiation.
Reason (R) : Stopping potential is independent of the intensity of the incident radiation.
Radiation of wavelength 200 nm is incident on a photosensitive surface of work function 4·2 eV. The kinetic energy of fastest photoelectrons emitted from this surface will be close to :
A researcher performs an experiment on photoelectric effect using two metals A and B with unknown work functions. She illuminates the surfaces of A and B with monochromatic radiation of various frequencies and records the corresponding stopping potentials \((V_s)\). The graph shows the variation of stopping potential \((V_s)\) with the frequency of incident radiation \((\nu)\) for metals A and B.
Answer the following questions:
A researcher performs an experiment on photoelectric effect using two metals A and B with unknown work functions. She illuminates the surfaces of A and B with monochromatic radiation of various frequencies and records the corresponding stopping potentials \((V_s)\). The graph shows the variation of stopping potential \((V_s)\) with the frequency of incident radiation \((\nu)\) for metals A and B.
Answer the following questions:
Assertion (A): On increasing the intensity of incident light of frequency \( v(> v_0) \) on a photosensitive surface, the photocurrent increases. Reason (R): The stopping potential for a photosensitive surface increases with increase of frequency \( v(> v_0) \) of incident light.
The maximum kinetic energy of photoelectrons depends on
In a photoelectric experiment, the emitter plate is irradiated with radiation of \(200\ \text{nm}\). The photocurrent becomes zero when the collector plate potential is \(-0.80\ \text{V}\). Calculate the work function (in eV) of the emitter.
Photoemission of electrons occurs from a metal \((\phi_0=1.96\,\text{eV})\) when light of frequency \(6.4\times10^{14}\,\text{Hz}\) is incident on it. Calculate the maximum kinetic energy of the emitted electrons.
Photoemission of electrons occurs from a metal \((\phi_0=1.96\,\text{eV})\) when light of frequency \(6.4\times10^{14}\,\text{Hz}\) is incident on it. Calculate: Energy of a photon in the incident light.
Photoemission of electrons occurs from a metal \((\phi_0=1.96\,\text{eV})\) when light of frequency \(6.4\times10^{14}\,\text{Hz}\) is incident on it. Calculate the stopping potential.
Assertion (A) : Photoelectric effect is a spontaneous phenomenon. Reason (R) : According to the wave picture of radiation, an electron would take hours/days to absorb sufficient energy to overcome the work function and come out from a metal surface.
Assertion (A): On increasing the intensity of incident light of frequency \( v(> v_0) \) on a photosensitive surface, the photocurrent increases. Reason (R): The stopping potential for a photosensitive surface increases with increase of frequency \( v(> v_0) \) of incident light.
The maximum kinetic energy of photoelectrons depends on
In a photoelectric experiment, the emitter plate is irradiated with radiation of \(200\ \text{nm}\). The photocurrent becomes zero when the collector plate potential is \(-0.80\ \text{V}\). Calculate the work function (in eV) of the emitter.
Photoemission of electrons occurs from a metal \((\phi_0=1.96\,\text{eV})\) when light of frequency \(6.4\times10^{14}\,\text{Hz}\) is incident on it. Calculate the stopping potential.
Photoemission of electrons occurs from a metal \((\phi_0=1.96\,\text{eV})\) when light of frequency \(6.4\times10^{14}\,\text{Hz}\) is incident on it. Calculate: Energy of a photon in the incident light.
Photoemission of electrons occurs from a metal \((\phi_0=1.96\,\text{eV})\) when light of frequency \(6.4\times10^{14}\,\text{Hz}\) is incident on it. Calculate the maximum kinetic energy of the emitted electrons.
Assertion (A) : Photoelectric effect is a spontaneous phenomenon. Reason (R) : According to the wave picture of radiation, an electron would take hours/days to absorb sufficient energy to overcome the work function and come out from a metal surface.
તરંગલંબાઈ \( \lambda \)વાળા પ્રકાશનું કિરણ ત્રણ ફોટોઇલેક્ટ્રિક સેલ પર પડે છે. જો \( \lambda_1 \le \lambda \), \( \lambda_2 \gt \lambda \), \( \lambda_3 \gg \lambda \) હોય તો સ્ટોપિંગ પોટેન્શિયલ \( V_1, V_2, V_3 \) માટે સાચો વિકલ્પ છે:
પ્રકાશનું એક કિરણ એક ધાતુની સપાટી પર પડે છે જેથી ફોટો-ઇલેક્ટ્રોન ઉત્પન્ન થાય છે. જો પ્રકાશ સ્ત્રોતની શક્તિ સમય સાથે રેખીય રીતે ઘટતી જાય છે, તો ફોટોકરંટ \( I \) અને સ્ટોપિંગ પોટેન્શિયલ \( |V| \)ના સમય સાથે વ્યવહારને શ્રેષ્ઠ રીતે દર્શાવતું છે:
तरंगदैर्ध्य \(\lambda\) की प्रकाश की एक किरण तीन अलग-अलग प्रकाश-वैद्युत सतहों 1, 2 और 3 पर आपतित होती है, जिनकी कार्य-फलन क्रमशः \(\lambda_1,\lambda_2,\lambda_3\) से संबंधित हैं। यदि उत्सर्जित इलेक्ट्रॉनों के अधिकतम गतिज ऊर्जा क्रमशः \(V_1,V_2,V_3\) हैं और \(\lambda_1\lt \lambda\lt \lambda_2\), तथा \(\lambda_3\gt \gt \lambda\), सही विकल्प है :
प्रकाश की एक किरण एक पारदर्शी सतह पर इस प्रकार गिरती है कि प्रकाश-विद्युत प्रभाव नहीं होता है। यदि प्रकाश की तीव्रता को कम करते समय उसे द्विगुणित कर दिया जाता है, तो ग्राफ के अनुसार फोटो-करंट \(I\) और निरोधक विभव \(|V|\) में समय के साथ परिवर्तन का सही विकल्प कौन-सा है?

A ray of light with wavelength \(\lambda\) is incident on three different photoelectric cells. The threshold wavelengths are \(\lambda_1\), \(\lambda_2\), and \(\lambda_3\), and the magnitudes of stopping potentials are \(V_1\), \(V_2\), and \(V_3\), respectively. If \[ \lambda_1 \le \lambda, \qquad \lambda_2 \gt \lambda, \qquad \lambda_3 \gg \lambda \]