Question

Will there be photoelectric emission for an incident wavelength of 4000 A° if threshold
wavelength is 3800 A° ?​

Answer 1

Answer:

No. It wont

Explanation:

We know, if the frequency of the incident radiation is greater than the threshold frequency, photoelectric emission will occur.

If we consider the speed of photon be constant and equal to 3X10⁸ m/s,

we see that frequency of 3800 A° is greater than 4000 A° since, $frequency = \frac{c}{wavelength}$ where c = speed of photon. Since, the frequency of the incident light is lesser than threshold frequency, the photoelectric effect will not happen