A laser emits a beam of light whose photons all have the same frequency. when th

Question

A laser emits a beam of light whose photons all have the same frequency. when the beam strikes the surface of a metal, photoelectrons are ejected from the surface, what happen if the laser emits twice the number of photons per second?
a)the photoelectrons are ejected from the surface with twice the maximum kinetic energy.
b)the photoelectrons are ejected from the surface with the same maximum kinetic energy.
C)the number of photoelectrons ejected per second from the surface doubles.
d)both b and c happens
e) both a and c happens

Explanation / Answer

The answer is: d) both b and c happens

The maximum kinetic energy of the photoelectrons depends on the frequency of the photons and the workfunction of the metal. Since the frequency and workfunction do not change, the maximum kinetic energy stays the same.

The number of photoelectrons ejected per second is proportional to the intensity of the beam, i.e. the number of photons per second. Since the intensity doubles, the number of photoelectrons also doubles.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.