What minimum frequency of light is needed to eject a photoelectron from atoms of of platinum, which require at least 9.08 x 10^-19 j/photon?

f = 1.37 × 10¹⁵ Hz

Explanation:

Given data:

Energy of photon = 9.08 × 10⁻¹⁹ j

Frequency = ?

Solution:

Formula:

E = h. f

f = frequency

h = planck's constant

E = energy

Now we will put the values in formula.

h = 6.63  × 10⁻³⁴ j.s  

9.08 × 10⁻¹⁹ j =  6.63  × 10⁻³⁴ j.s  × f

f = 9.08 × 10⁻¹⁹ j / 6.63  × 10⁻³⁴ j.s

f = 1.37 × 10¹⁵ s⁻¹

s⁻¹ = Hz

f = 1.37 × 10¹⁵ Hz

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

the answer is option a.