Phototeffect

Which best describes Einstein’s explanation of the photoelectric effect?

• Light energy is concentrated in distinct “packets”.

• Light energy is evenly distributed over the entire wave front.

• Metallic surfaces always absorb electrons when illuminated.

• Metallic surfaces always emit electrons when illuminated.

If light is incident on a metal surface, which property of light will determine if electrons will be emitted?

• amplitude

• frequency

• intensity

• wavelength

When light of frequency 8.6 × 10¹⁴ Hz is incident on a metal surface, the maximum kinetic energy of the photoelectrons is 0.500 eV. What is the work function of the metal?

• 0.50 eV

• 3.1 eV

• 3.5 eV

• 4.1 eV

What is the stopping potential for an ejected photoelectron that has 3.40 x 10^-19 J of kinetic energy?

• 0.47 eV

• 2.13 eV

• 3.40 eV

• 5.44 eV

If an electron has a speed of 1.0 × 104 m/s, what potential difference must be applied

to stop the electron?

• 4.6 × 10^-23 V

• 8.4 × 10^-20 V

• 2.8 × 10^-4V

• 5.2 × 10^-1 V

If the wavelength of light is 250 nm, what is

the maximum kinetic energy of the photoelectrons in a metal that has a work function of 4.5 eV?

• 0 eV

• 0.47 eV

• 0.37 eV

• 0.53 eV

If the stopping potential of a photoelectric cell is 5.60 V, what is the maximum kinetic energy of the photoelectrons emitted?

• 2.90 × 10^-20 J

• 8.96 × 10^-19 J

• 5.60 × 10¹ J

• 3.50 × 10¹⁹ J

A metal with a work function of 4.56 eV is illuminated by light with a wavelength of 1.7 x 10^-7 m. What is the maximum kinetic energy of the emitted photoelectrons?

• 4.4 × 10^-19 J

• 7.3 × 10^-19 J

• 1.9 × 10^-18 J

• 1.5 × 10^-18 J

The threshold frequency of zinc for the photoelectric effect is in the ultraviolet range. Which of the following will

occur if X-rays are shone on a zinc metal surface?

• (A) No electrons will be emitted from the metal.

• (B) Electrons will be released from the metal but have no kinetic energy.

• (C) Electrons will be released from the metal and have kinetic energy.

• (D) Electrons will be released from the metal but will immediately be recaptured by the zinc atoms.

• (E) Electrons will simply move from one zinc atom in the metal to another zinc atom in the metal.

Which of the following is true of the momentum of a photon?

• (A) It is proportional to the wavelength of the photon.

• (B) It is inversely proportional to the wavelength of the photon.

• (C) It is inversely proportional to the square of the wavelength of the photon.

• (D) It is proportional to the mass of the photon.

• (E) It is equal to the energy of the photon.