Kinetic energy of ejected electron from metal

Practice question

Question

The energy required to eject an electron from a metal is 4.5 × 10⁻¹⁹ J. If light of frequency 8.0 × 10¹⁴ Hz is used, what is the kinetic energy of the ejected electron? (h = 6.626 × 10⁻³⁴ J s)

Choose one · Correct answer highlighted

4.5 × 10⁻¹⁹ J 5.3008 × 10⁻¹⁹ J 1.3252 × 10⁻¹⁹ J 8.008 × 10⁻²⁰ J Correct

E ≈ 5.301×10⁻¹⁹ J. KE ≈ 8.008×10⁻²⁰ J.

Share this question

Guides and insights connected to this topic

Virology 25 Jan 2026

Coronavirus Overview Coronaviruses (CoVs) are enveloped viruses (surrounded by a lipid membrane derived from host cells), belonging to the s...

Virology 25 Jan 2026

Structure of Coronavirus Coronaviruses (enveloped RNA viruses) fall in the virus family Coronaviridae, order Nidovirales. They are enveloped...

Virology 25 Jan 2026

Cucumber Mosaic Virus (CMV): Introduction and Importance Cucumber Mosaic Virus (CMV) (plant-infecting RNA virus) is one of the most economic...