Queetion: 1. a) What is the terminal velocity of a 100-um diameter spherical particle settling in (i) (ii) Also calculate the drag coefficient at the terminal settling velocity in water and air. Particle density Water density Air density Viscosity of water : 0.001 kg/m.s Viscosity of air b) Calculate the maximum size of the particles that can settle in water and air under Stokesian conditions. water, and air : 2670 kg/m : 1000 kg/m :1.2 kg/m : 17.5x10 kg/m.s
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
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