04-11-2018, 04:50 PM

Hey everybody i've been going over some of my practice exams and I am baffled by how I answer this one question. It provides the table

___________________________

Frequency (s^(-1) | Kinetic Energy|

6.977 * 10^14 | ---

1.145 * 10^15 | 0

1.266 * 10^15 | .50

and asks my to determine the maximum wavelength in nm that will eject an electron from an unknown sample.

Looking at my work, I took the equation: frequency = speed of light/wavelength. I changed this so it was wavelength = speed of light/frequency, and found myself dividing (3*10^8) by (1.145*10^15) to find my wavelength. However, the answer I got on my test, 26.182 m, is not the answer I get when I divide this now (I get 2.62 * 10^(-7)). What am I doing wrong? Why is the answer im getting now smaller by a factor of 10^8?. In nanometers, my final answer on the test was 2.6 * 10^10 nm, which is the correct answer.

Thanks in advance.

___________________________

Frequency (s^(-1) | Kinetic Energy|

6.977 * 10^14 | ---

1.145 * 10^15 | 0

1.266 * 10^15 | .50

and asks my to determine the maximum wavelength in nm that will eject an electron from an unknown sample.

Looking at my work, I took the equation: frequency = speed of light/wavelength. I changed this so it was wavelength = speed of light/frequency, and found myself dividing (3*10^8) by (1.145*10^15) to find my wavelength. However, the answer I got on my test, 26.182 m, is not the answer I get when I divide this now (I get 2.62 * 10^(-7)). What am I doing wrong? Why is the answer im getting now smaller by a factor of 10^8?. In nanometers, my final answer on the test was 2.6 * 10^10 nm, which is the correct answer.

Thanks in advance.