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Photoelectric Effect - Quiz

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In this experiment, if the frequency of incident light is changed from blue to violet (frequency increases), the ejected electrons will have:

Photoelectric Effect - Quiz - Quiz Questions

Check your understanding of the photoelectric effect laws, photon theory, and Einstein's equation through these exercises.

1. In this experiment, if the frequency of incident light is changed from blue to violet (frequency increases), the ejected electrons will have:

A. Significantly increased number
B. Increased maximum kinetic energy
C. Increased work function
D. Decreased escape velocity

2. Einstein proposed the photon hypothesis primarily to explain which experimental fact of the photoelectric effect that classical wave theory could not explain?

A. Photocurrent varies linearly with light intensity
B. Photoelectron emission is instantaneous
C. Existence of a cutoff frequency
D. All of the above

3. If photoelectrons are ejected, increasing only the intensity of the incident light (frequency unchanged) will result in:

A. Increased saturation photocurrent
B. Increased stopping voltage
C. Lowered cutoff frequency
D. Decreased work function

4. The measured stopping voltage for a certain metal is $1.5V$. What is the maximum initial kinetic energy of the ejected electrons?

A. $1.5\,\text{J}$
B. $1.5\,\text{eV}$
C. $3.0\,\text{eV}$
D. Cannot be calculated

5. Regarding "Work Function" $\Phi$ in the photoelectric effect, which statement is correct?

A. It is proportional to the frequency of incident light
B. It decreases as exposure time increases
C. It is the minimum energy required for an electron to escape from the metal surface
D. It equals the maximum kinetic energy of the electron after escape

6. If the work function of a metal is $2.0 eV$ and it is illuminated by photons with energy $3.5 eV$, the maximum initial kinetic energy of the ejected electrons is:

A. $1.5\,\text{eV}$
B. $2.0\,\text{eV}$
C. $3.5\,\text{eV}$
D. $5.5\,\text{eV}$

7. In the steps to "Verify Einstein's Equation", which variable must be kept constant to study the relationship between maximum initial kinetic energy and frequency?

A. Frequency of incident light
B. Intensity of incident light
C. Metal material (Cathode)
D. Reverse voltage

8. True or False: For the same metal, regardless of the incident light frequency, simply increasing the light intensity will increase the maximum initial kinetic energy of photoelectrons.

True
False

9. In the $K_{max} - f$ graph (frequency on x-axis, maximum initial kinetic energy on y-axis), what does the slope of the line represent?

A. Work function $\Phi$
B. Planck constant $h$
C. Electron charge $e$
D. Cutoff frequency $f_0$

10. Why typically can violet light (high frequency) cause the photoelectric effect in a zinc plate while red light (low frequency) cannot?

A. Red light is too dim
B. Red light travels slower than violet light
C. Red light photon energy is less than the work function of zinc
D. Zinc plates only absorb violet-colored light