In particular, the photon model accounted for the frequency dependence of light's energy, and explained the ability of matter and radiation to be in thermal equilibrium.he energy of a system that emits a photon is decreased by the energy of the photon as measured in the rest frame of the emitting system, which may result in a reduction in mass in the amount. Similarly, the mass of a system that absorbs a photon is increased by a corresponding amount.
Responding to the changes, the Finnish company started churning out both sophisticated multimedia handsets as well as low-end devices. The year 2001 saw the company launching the Nokia 7650, its first phone to feature a built-in camera. It was also the first to sport a full color display.
BlackBerry 850 was the first BlackBerry device introduced in 1999. Supporting email and limited HTML browsing, the small device featured a monochrome screen. The BlackBerry 857 came with a larger monochrome screen. The BlackBerry 5810 was the first model with phone capabilities but a headset was required. The BlackBerry 6200 featured a medium 160Ã100 pixel monochrome screen and phone. BlackBerry 6510 came with an integrated phone and integrated two-way radio. The BlackBerry 6710 had a large monochrome screen, 900/1900 MHz GSM/GPRS integrated phone. The BlackBerry 7210 was the first one to come with a color screen.