Photoelectric Effect Threshold

Threshold (Cut-off) Frequency ( $f_{0}$ ): This is the minimum frequency of incident radiation below which no electrons are emitted, regardless of how intense the light is.
Requirement: The energy of a single photon ( $h f$ ) must be at least equal to the Work Function ( $Φ$ ) of the metal. $h f \geq Φ ⟹ f \geq \frac{Φ}{h} = f_{0}$ If $f < f_{0}$ , the photons don't have enough energy to libearte an electron from the metal's surface.

This easy difficulty physics question is from the chapter dual nature of radiation and matter, covering the topic of photoelectric effect threshold. It appeared in the 2025 exam.

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Photoelectric Effect Threshold

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In a photoelectric experiment the stopping potential rises from $0.50 V$ to $2.15 V$ ...

Inside a reactor a neutron of mass $1.67 \times 1 0^{- 27} kg$ has been slowed to thermal equili...

Identical electrons are accelerated from rest, one through a potential difference of $50 V$ ...

A metal surface of work function $1.0 eV$ is illuminated separately by light of wavelength $...

A photoemissive metal requires a minimum energy of $3.3 eV$ to release an electron from its ...

Monochromatic radiation of wavelength $248 nm$ falls on a photosensitive cathode whose work ...

Green light of wavelength $5 \times 1 0^{- 7} m$ from a laser pointer is incident normally on a ...