Photoelectric effect and atomic spectra

Question 1 of 10

Find the frequency of light of wavelength 600 nm. (c = 3 × 10⁸ m/s)

Question 2 of 10

An electron-volt is the energy

Question 3 of 10

The threshold frequency is

Question 4 of 10

Ultraviolet light of wavelength 400 nm falls on a metal surface of work function 2.3 eV. (h = 6.6 × 10⁻³⁴ J s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10⁻¹⁹ J) Calculate (a) the energy of each photon in joules and in eV, (b) the maximum kinetic energy of the emitted electrons in eV, (c) the threshold frequency of the metal. (d) State the effect of doubling the intensity of the light.

Question 5 of 10

Find the energy of a photon of frequency 7.5 × 10¹⁴ Hz. (h = 6.6 × 10⁻³⁴ J s)

Question 6 of 10

Ultraviolet light of wavelength 300 nm falls on a metal surface of work function 2 eV. (h = 6.6 × 10⁻³⁴ J s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10⁻¹⁹ J) Calculate (a) the energy of each photon in joules and in eV, (b) the maximum kinetic energy of the emitted electrons in eV, (c) the threshold frequency of the metal. (d) State the effect of doubling the intensity of the light.

Question 7 of 10

Find the energy of a photon of frequency 1 × 10¹⁵ Hz. (h = 6.6 × 10⁻³⁴ J s)

Question 8 of 10

Photons of energy 5.2 eV fall on a metal of work function 3.2 eV. The maximum kinetic energy of the photoelectrons is ___ eV.

Question 9 of 10

Photons of energy 3.2 eV fall on a metal of work function 2.2 eV. The maximum kinetic energy of the photoelectrons is ___ eV.

Question 10 of 10

Light of photon energy 6 eV falls on a metal of work function 3 eV. Find the maximum kinetic energy of the photoelectrons.