A material of a resistivity p = 0.088 2. m is used to make three resistors in the shape of solid cubes. Resistor 1 has sides of length a1 = 6 cm; resistor 2 of length a2 = 1.7-a1, and resistor 3 of length az = 2.4-a1. (Reminder: a cube has the same width, length, and height.) The three resistors are then connected in series as in the figure below. A battery of ɛ = 38 V and an internal resistance r = 0.82 2 is applied across their combination. R2 R, R3 a) The resistance of the resistor R1 is about: 1.47 Ω. b) The resistance of the resistor R2 is about: 0.86 v Q. c) The resistance of the resistor R3 is about: 0.61 Ω. d) The equivalent resistance of the series combination of R1, R2, and R3 is about 2.94 2. >

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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.