Take this Quiz: A-Level Physics: Quantum Phenomena | Zestly

Question 1

A metal surface has a work function of $4.20 	imes 10^{-19} 	ext{ J}$. If monochromatic light with a frequency of $7.50 	imes 10^{14} 	ext{ Hz}$ is incident on the surface, what is the maximum kinetic energy of the emitted photoelectrons? (Use Planck constant $h = 6.63 	imes 10^{-34} 	ext{ J s}$)

Accepted Answer

$0.77 	imes 10^{-19} 	ext{ J}$

Question 2

Which of the following statements correctly describe why classical wave theory fails to explain the photoelectric effect? Select all that apply.

Accepted Answer

Wave theory predicts that any frequency of light should eventually eject electrons if intensity is high enough.

Question 3

An electron is accelerated from rest through a potential difference of $250 	ext{ V}$. What is its de Broglie wavelength? (Use $m_e = 9.11 	imes 10^{-31} 	ext{ kg}$, $e = 1.60 	imes 10^{-19} 	ext{ C}$, $h = 6.63 	imes 10^{-34} 	ext{ J s}$)

Accepted Answer

$0.078 	ext{ nm}$

Question 4

In a hydrogen atom, an electron transitions from the $n=3$ level to the $n=1$ level. The energy levels are $E_1 = -13.6 	ext{ eV}$ and $E_3 = -1.51 	ext{ eV}$. What is the frequency of the emitted photon? ($1 	ext{ eV} = 1.60 	imes 10^{-19} 	ext{ J}$, $h = 6.63 	imes 10^{-34} 	ext{ J s}$)

Answer

$1.8 	imes 10^{14} 	ext{ Hz}$

Answer

$2.9 	imes 10^{15} 	ext{ Hz}$

Answer

$3.3 	imes 10^{15} 	ext{ Hz}$

Answer

$4.1 	imes 10^{15} 	ext{ Hz}$

Question 5

Which of the following factors affect the stopping potential of a photoelectric cell? Select all that apply.

Answer

The frequency of the incident radiation.

Answer

The intensity of the incident radiation.

Answer

The work function of the metal surface.

Answer

The surface area of the metal plate.