Quiz for Photoelectric Effect-

Q1: What is the minimum energy required to eject an electron from a metal surface called?

A. Kinetic energy B. Binding energy C. Work function D. Potential energy

Q2: Which particle is emitted in the photoelectric effect?

A. Proton B. Electron C. Photon D. Neutron

Q3: The photoelectric effect supports which nature of light?

A. Wave nature B. Particle nature C. Dual nature D. None of the above

Q4: Which of the following affects the maximum kinetic energy of photoelectrons?

A. Intensity of light B. Frequency of incident light C. Angle of incidence D. Surface area of metal

Q5: What is the threshold frequency?

A. Frequency above which emission stops B. Minimum frequency for photoemission C. Average frequency D. Frequency of X-rays

Q6: The equation E = hf - φ is known as?

A. Einstein’s photoelectric equation B. Planck’s equation C. Bohr’s rule D. Schrödinger equation

Q7: Photoelectric current increases with?

A. Increasing frequency B. Increasing wavelength C. Increasing intensity D. Decreasing intensity

Q8: If the frequency of light is below threshold, then?

A. Electrons are emitted B. Kinetic energy increases C. No emission occurs D. Photon energy increases

Q9: Which unit is used to express work function?

A. Joule B. Electron-volt C. Watt D. Newton

Q10: Kinetic energy of emitted electrons depends on?

A. Intensity B. Frequency C. Wavelength D. Time of exposure

Q11: Which of the following does NOT affect photoelectric emission?

A. Intensity of light B. Frequency of light C. Nature of metal D. Temperature of light

Q12: Stopping potential is used to measure?

A. Work function B. Kinetic energy C. Threshold frequency D. Number of electrons

Q13: Photoelectric effect occurs instantly because?

A. Electrons are light B. Energy is transferred by photons instantly C. Metal gets heated D. All of the above

Q14: The photoelectric effect was explained by?

A. Newton B. Maxwell C. Einstein D. Bohr

Q15: What happens to the photoelectric current when intensity doubles?

A. Doubles B. Halves C. Becomes zero D. Increases exponentially

Q16: Which of the following has the highest photon energy?

A. Infrared B. Microwave C. UV D. Radio wave

Q17: Electrons are emitted only if the energy of photon is?

A. Less than work function B. Equal or more than work function C. Equal to zero D. Unrelated to work function

Q18: Which metal is commonly used in photoelectric cells?

A. Copper B. Zinc C. Sodium D. Lead

Q19: What is emitted when light of suitable frequency strikes a metal?

A. Electrons B. Protons C. Neutrons D. Photons

Q20: Which law of classical physics failed to explain the photoelectric effect?

A. Newton’s Laws B. Electromagnetic theory C. Thermodynamics D. Ohm’s law