Atomic and Nuclear Phenomena Crossword Puzzle

QUESTIONS LIST: photoelectric effect : a phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation, hertz : what is the surname who discovered photoelectric effect in 1887, max planck : he explained the wavelength distribution of black body radiation in 1900, albert einstein : a new corpuscular theory of light in which each particle of light contains a fixed amount of energy that depends on the light's frequency, half life : each nucleus has a 50% chance of living for a time equal to one _ , continuous : _ spectrum - it consists of all wavelengths within a certain range, radioactivity : the spontaneous breakdown of an unstable atomic nucleus accompanied by the emission of particles and rays, atomic spectra : the spectrum of the electromagnetic radiation emitted or absorbed by an electron during transitions between different energy levels within an atom, emission spectrum : formed by the frequencies of these emitted light, absorption : _ spectrum - it is constituted by the frequencies of light transmitted with dark bands, philipp lenard : he demonstrated that electrically charged particles are liberated from a metal surface, alpha particles : composed of two protons and two neutrons; hence they are helium nuclei, decay : other term for 'daughter element', gamma rays : are high-energy electromagnetic waves, beta particles : are electrons which have negative charges and travel at nearly the speed of light.