Question

The phenomenon of removal of electrons from a metal surface when it is made to strike with radiation of suitable frequency is called:

• A. Compton effect
• B. Stark effect
• C. Zeeman effect
• D. Photoelectric effect

Hint:

Photoelectric effect occurs only when frequency of incident light is above threshold frequency.

Answer 1

The Correct Option is D

Step 1: Grasping the event.
When light of adequate frequency impinges on a metal and liberates electrons, the phenomenon is termed photoelectron emission.

Step 2: Naming the effect.
This light-induced ejection of electrons is known as the photoelectric effect.

Step 3: Ruling out other phenomena.
The Compton effect involves X-ray scattering; the Stark effect describes spectral line splitting in an electric field; the Zeeman effect occurs in a magnetic field.

Step 4: Conceptual clarity.
Only the photoelectric effect entails electron release from a metal via incident radiation.

Step 5: Final deduction.
Therefore, the correct choice is the photoelectric effect.