Bissoy.com
Doctors Medicines MCQs Q&A

The maximum kinetic energy of the photoelectrons varies

The maximum kinetic energy of the photoelectrons varies Correct Answer Linearly with the frequency and is independent of the intensity of the incident radiation

CONCEPT:

  • Photoelectric effect: When electromagnetic radiation hits a material, electrons are emitted, this effect is known as the Photoelectric effect.
    • Electrons emitted in this manner are called photo-electrons.

[ alt="F1 J.K Madhu 10.07.20 D17" src="//storage.googleapis.com/tb-img/production/20/07/F1_J.K_Madhu_10.07.20_D17.png" style="width: 234px; height: 171px;">

  • Max Kinetic energy of these photo-electrons is given by:

⇒K.E.max = h f - ϕ 

Where h is the Planck constant f is the frequency of the incident light or electromagnetic radiation. The term ϕ is the work function.

  • The work function is the property of the material.

EXPLANATION:

  • The maximum kinetic energy of the photo-electron is given by 

⇒ K.E.max = h f - ϕ 

where h is the Planck constant f is the frequency of the incident light or electromagnetic radiation. The term ϕ is the work function.

  • The above equation is similar to the equation of a straight line

⇒ Y= mX + C

  • Hence, KEmax varies linearly with frequency and there are no terms representing the intensity of the incident light. Hence, option 4 is the answer.

Related Questions

Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is
Maximum kinetic energy (Ek) of photoelectrons varies with frequency (v) of incident radiation as shown in graph: 
Consider the following statement: 1. The number of photoelectrons emitted is proportional to the intensity of the incident beam. 2. The kinetic energy of emitted electrons in the photoelectric effect does not depend on intensity. 3. The kinetic energy of emitted electrons in the photoelectric effect does not depend on frequency. Which of the following statement is INCORRECT?
Match the following Device Conversion of Energy (a) Windmill (i) Chemical Energy to electrical energy (b) Bulb (ii) Kinetic Energy to Electrical Energy (c) Electrical Cell (iii) Sound Energy to Electrical energy (d) Microphone (iv) Electrical Energy to Light Energy
What does hydropower change A. Kinetic energy to electrical energy B. Mechanical energy from electrical energy C. Chemical energy to electrical energy D. Wind energy to electrical energy
A photocathode has a work function of 2.4 eV. It is illuminated with a monochromatic radiation whose photon energy is 3.9 eV. The maximum kinetic energy of the photoelectrons produced is:
একটি ধাতুর ওপর সবুজ আলো আপতিত হলে ফটোইলেক্ট্রন নির্গত হয়। নিচের কোন বর্ণের আলো আপতিত হলে ঐ তল থেকে অবশ্যই ফটোইলেক্ট্রন নির্গত হবে? (A metal surface emits photoelectrons when illuminated by green light. Illumination with which of the following colour of light will definitely cause photoelectrons to be emitted from the surface?)
The kinetic energy of a man is half that of a boy whose mass is half that of the man. When the man speeds up by 5 m/s, his kinetic energy doubles that of the boy’s kinetic energy. What is the initial velocity of the man?
Which of the following statement(s) is/are incorrect? (i) A turbine is called an impulse turbine if at the inlet of the turbine total energy is only kinetic energy (ii) A turbine is called a reaction turbine if at the inlet of the turbine the total energy is kinetic energy and pressure energy (iii) The inward flow reaction turbine having radial discharge at the outlet is known as Kaplan turbine
A stone has initial potential, kinetic and internal energy 7 J, 10 J and 2x J respectively, if the final kinetic energy, potential energy and internal energy are 5 J, 21 J and x respectively, what is the final internal energy?