Photoelectric effect and atomic spectra

Question 1 of 10

Each element has its own characteristic line spectrum.

Question 2 of 10

The work function of a metal is

Question 3 of 10

Ultraviolet light of wavelength 400 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 4 of 10

Photons of energy 4.5 eV fall on a metal of work function 2.5 eV. The maximum kinetic energy of the photoelectrons is ___ eV.

Question 5 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.

Question 6 of 10

Photoemission is delayed if the light is dim.

Question 7 of 10

The work function is the same for all metals.

Question 8 of 10

Blue light photons carry more energy than red light photons.

Question 9 of 10

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

Question 10 of 10

1 eV = 1.6 × 10⁻¹⁹ J.