A cesium photoelectron has a kinetic energy of 2 eV.
a) What is the maximum frequency of light that could have emitted this electron? Data: Cesium work function = 1.8 eV, Planck's constant h = 6.62×10⁻³⁴ J.s, 1 eV = 1.6×10⁻¹⁹ J.
b) What is the maximum wavelength of this frequency? Data: speed of light c = 3×10⁸ m/s.

The surface temperature of the Sun is approximately 5700 K, and the temperature of the human body, under normal conditions, is 36°C. Mark in the spectrum below the approximate wavelengths that correspond to the greatest intensity of radiation emitted by these bodies.

In a thermonuclear explosion, the temperature at the center of the explosion is momentarily 10⁷ K. Find the wavelength for which the emitted radiation is maximum.

At what wavelength does a cavity at 6000 K radiate most per unit wavelength?