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Using Einstein's photoelectric equation ...

Using Einstein's photoelectric equation show how the cut -off voltage and threshold frequency for a given photosensitive material can be determined with the help of a suitable plot/graph.

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To determine the cut-off voltage and the threshold frequency for a given photosensitive material using Einstein's photoelectric equation, we can follow these steps: ### Step 1: Understand Einstein's Photoelectric Equation Einstein's photoelectric equation is given by: \[ K.E. = h\nu - \phi \] ...
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The graph between frequency of incident radiations and stopping potential for a given photosensitive material as follows. What information can be obtained from the value of the intercept on the potential axis ?

In an experiment on photoelectric effect, the slope of the cut off voltage versus frequency of incident light is found to be 4.12xx10^(-15)Vs . Given e=1.6xx10^(-19)C , estimate the value of Planck's constant.

In the photoelectric effect the electrons are emiited instantaneously from a given metal plate when it is irradiated with radiation of frequency equal to or greater than some minimum ferquency, is called the threshold frequency.According to Planck's idea, light may be considered to be made up discrete particles called photons.Each photon carries energy equal to hv.When this photon collides with the electron of the metal, the electron acquires energy of the emitted electron is given by : hv=K.E_("maximum")+PE=(1)/(2)m u^(2)+PE If the incident rediation is of threshold frequency the electron will be emitted without any kinetic energy i.e hv_(0) :.(1)/(2)m u^(2)=hv-hv_(0) A plot of kinetic energy of the emitted electron versus frequency of the incident radiation yields a straight line given as : A laser producting monochromatic lights of different wavelenght is uesd to eject electrons from the sheet of gold having threshold frequency 6.15xx10^(14)s^(-1) Which of the following incident rediation will be suitable for the ejecting of electrons ?

Sketch the graphs, showing the variation of stopping potential V_s with frequency v of the incident radiations for two photosensitive materials A and B having threshold frequencies v_0gtv'_0 respectively. (i) which of the two metals A or B has higher work function? (ii) What information do you get from the slope of the graphs? (iii) What does the value of the intercept of graph A on the potential axis represent?

(a) (i) Write Einstein.s photo electric equation. (ii) if the frequency of the incident radiation is increased from 4xx10^(15) Hz to 8xx10^(15) Hz by how much will the stopping potential for a given photosensitive surface go up ? (b) Laser light of wavelength 630 nmis incident on a pair of slits which are separated by 1.8 mm. If the screen is kept 80 cm away from the two slits. calculate : (i) fringe separation i.e., fringr width (ii) distance of 10^("th") bright fringe from the centre of the interference pattern.

What is the photoelectric effect? With the help of suitable graph show the variation of photocurrent with (i) the intensity of incident radiation. (ii) the voltage applied between cathode and anode. (iii) the frequency of incident radiation.

RESONANCE ENGLISH-ATOMIC PHYSICS-Exercise -3 part -I JEE (Advanced)
  1. Define ionisation energy . What is its value for a hydrogen atom ?

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  2. Write Einstein's photoelectric equation . State clearly the three sali...

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  3. Derive an expression for the magnetic moment (vec mu) of an electron r...

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  4. Define the term 'stopping potential' in relation to photoelectric effe...

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  5. (a) Using de Broglie's hypothesis, explain with the help of a suitable...

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  6. A proton and an electron have same kinetic energy. Which on has smalle...

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  7. Using Einstein's photoelectric equation show how the cut -off voltage ...

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  8. A nuclear fusion reaction is given by .(1)H^(2)+.(1)H^(2)rarr.(1)He^...

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  9. Using Bohr's postulates, obtain the expression for the total energy of...

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  10. Define the following in photoelectric effect phenomenon (a) (i) work...

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  11. The wavelength associated with an electron, accelerated through a pote...

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  12. Write Bohr's any two postulates for hydrogen atom.

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  13. The graph shows variation of stopping potential V(0) versus frequency ...

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  14. Why is it found experimentally difficult to detect neutrinos in nuclea...

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  15. Using Bohr's postulates of the atomic model. Derive the expression for...

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  16. An electron microscope uses electrons accelerated by a voltage of 50 k...

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  17. A body of mass 70 kg travels with a speed of 15 km/hour. Calculate the...

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  18. The graph between the stopping potential V(0) and frequency v for two ...

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  19. (i) Mono chromatic light of frequency 6.0xx10^(14)Hz is produced by a ...

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  20. The ground state energy of hydrogen atom is -13.6 eV . What is the kin...

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