Calculate the threshold frequency for a metal with a work function of 3eV

The equation for work function is: W = hf

So, this is rearranged to: f = W/h where h is planck's constant.

Therefore, if we know the work function then we can work out the threshold frequency.

Don't forget to convert 3eV into J. 1eV = 1.6 x 10^{-19} J.

f = (3 x 1.6 x 10^{-19})/(6.63 x 10^{-34})
f = 7.24 x 10^{14} Hz

AW
Answered by Anna W. Physics tutor

91928 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

How would we calculate the distance covered by a train that starts at rest, then accelerates to 5km/hr in 30 mins then stays at this constant speed for 12 minutes?


Explain why gas bubbles rise faster through magma as they start to expand. (3)


State what is meant by a Doppler shift and describe how it was used to study the movement of galaxies.


A car of mass 800 kg is accelerated horizontally by constant net force of 1920 N for 9 s. It then breaks for 2 s, but drives off a 5 m high cliff. If μ = 0.85, what is the total horizontal distance travelled by car and its velocity? Ignore air resistance.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences