Consider the centripetal force on the orbiting electron of the classical Bohr model illustrated in Fig. 4.3. Consider both a situation with and without a magnetic field present and show that when the field is present and directed upwards (perpendicular to the orbital plane), the electron speeds up by Av peB/2m, and that the change in its angular velocity then equals the Larmor frequency given in Eq. (4.9). As a follow-up to this, determine how large a magnetic field is needed to cause a 1% change in the orbital speed.
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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