Photons of visible wavelengths are shone on a surface starting with one end of the spectrum and gradually proceeding to the other end. When 589 nm is reached, electrons start coming out of the surface. Which of the following is true?
A)The spectrum scan started at the blue end.
B)Electrons would not be ejected at this wavelength for any material.
C)The spectrum scan started at the red end.
D)The spectrum scan could have started at either end.
E)none of the above

Question

Quizplus · Accepted Answer

The wavelength of 589 nm corresponds to the yellow region of the visible spectrum, which is closer to the red end. Since electrons start being ejected at this wavelength, it indicates that the scan started from the red end, as shorter wavelengths (towards blue) have higher energy.

Photons of Visible Wavelengths Are Shone on a Surface Starting