MANIFESTATIONS OF FREQUENCY

Frequency: Number of oscillations or vibrations per second or no. of waves per second or no. of rotations per second or simply number of repetitions per second in a periodic motions.

1. Consider a pendulum. Here no. of swings per second is the frequency. It only depends on the length of pendulum or vibrating body. So the length is the measure of frequency.

2. Consider a rotating wheel. If you multiply frequency of rotations with the circumference of the wheel, you get speed. So frequency determines the speed.

3. Frequency of sound waves gives rise to pitch or tone. A female voice has high frequency.

4. Frequency of electromagnetic waves decides its energy(E= h*freq.). More frequency means more energy. Radio waves, micro waves or light waves have small frequencies and they are not harmful to the human beings. But X-rays, gamma rays, ultraviolet rays have high frequencies and they carry high energies. They are not only harmful but may even kill a person.

5. Light is the form of electromagnetic waves. It's frequency decides wavelength, colour, and energy. Each colour light has its own frequency.

6. Quantum physics says that the sub-atomic particles behave like waves. If we calculate their frequencies, they yield very high value. So we may conclude that at super high frequencies, waves manifest into particles or mass. Example: Electron waves.

7. Electricity generators produce current in the form of sine waves. Here the frequency plays important role in the resistance of electrical circuit.

8. When the cooking vessel is heated, the billions of atoms in the metal vesssel vibrate vigorously. Here, the frequency of vibrations manifest as the heat.
Hence frequency and physics remains intertwined.

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THE EARTH, A SUPER ORGANISM

JOIN MY COURSE: "Become a programmer in a day with python" A man called 'love lock' (what a name) proposed a theory called Gaia theory, named after Greek Goddess. It says, "Earth is a self-regulating organism like a human being. The organic life in it interacts with in-organic matter and maintains atmosphere, temperature and environment". Hence the earth is still suitable for the life to thrive. Imagine, in a particular place, there are lot of flowers. Some flowers are white and some are darkly coloured. We know, white reflects light and heat while dark absorbs the same. White flowers can thrive in hot climate. But dark flowers requires cold climate. The absorption and reflection balances and the environment reaches average, warm temperature at which both the flowers can co-exist. This is the essence of "Gaia" theory. On our earth, the oxygen constitute 20% of the atmosphere. The oxygen level is always mai

THE PARABOLA

A jet of water shooting from a hose pipe will follow a parabolic path. What is the so special about parabola. Y= x^2 Draw a graph for the above equation. It will result in a parabola. This parabola is also called unit parabola. Any equation involving square will yield a parabola. Example: Y = 2x^2 +3x+3 (also called quadratic equation) X= 2 and -2, both satisfies the equation 4 = X^2. Parabolic equations always have two solutions. Any motion taking place freely under gravity follows parabolic path. Examples: An object dropped from a moving train, A bomb dropped from flying plane, A ball kicked upwards. If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point. This fact is made use of in Dish Antenna, Telescope mirrors, etc. Inverted parabola shape is used in the construction of buildings and bridges. Because the shape is able to bear more weight. A plane

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Imagine a balloon full of air. The air molecules are moving randomly inside the balloon. Let us pierce the balloon with a pin. The air rushes out. Why should not the air molecules stay inside the balloon safely and ignore the little hole? That is not the way the world works. The molecules always "want to occupy as many states as possible". Hence the air goes out in the open to occupy more volume. The things always goes into disorder (entropy) and the disorder increases with time. The above statement is what we call "second law of thermodynamics". Consider a cup of coffee on the table. Suppose the heat from entire room flows to your cup of coffee, the coffee will boil and the rest of the room will freeze. Freezing means bringing things to order and arrangement. It violates the second law. Hence it will never happen. Hence heat must flow from high temperature to low temperature and not the other way. The air molecules in y

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