Answer:
5.1 x 10¹⁴ Hz
Step-by-step explanation:
To find the frequency, you need to use the following equation:
E = hf
In this equation,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J·s)
-----> f = frequency (Hz)
You can plug the given values into the equation and simplify to find "f". The final answer should have 2 sig figs like the given measured value (h is a constant, so it's sig figs are irrelevant).
E = hf <----- Given equation
3.4 x 10⁻¹⁹ J = (6.626 x 10⁻³⁴ J·s)f <----- Insert variables
5.1 x 10¹⁴ Hz = f <----- Divide both sides by 6.626 x 10⁻³⁴