Question

How to determine kinetic energy from these values and the equation KEmax=hf−ϕ ?

I [ V pivot interactives > wavelength: 405 nm o intensity: Medium O 2. Use this table and graph to collect and analyze data. • Saved Wavelength Stopping Potent Uncertainty Kinetic Energy Frequency nm variable V variable v variable eV variable Hz variable 1 405 1.5 0.1 740740740740740.6 2 473 1 0.1 634249471458773.8 3 532 0.9 0.1 563909774436090.1 4. 589 0.6 0.1 509337860780984.6 5 635 0.4 0.1 472440944881889.7

Answer 1

Stopping potential is the minimum negative potential of anode at which the photocurrent drops to zero.

if K_max is the maximum kinetic energy of photoelectrons and V is stopping potential then,

K_max = eV where e is the charge of electron.

Stopping potential, V = K_max/e

If V is in volt and K_max is in eV then V = K_max

Stopping potential in V	Kinetic energy in eV
1.5	1.5
1.0	1.0
0.9	0.9
0.6	0.6
0.4	0.4