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Interference of Light Waves is defined as the modification in the distribution of light energy when two or more waves superimpose each other.

The principle of interference is responsible for the brilliant hues of certain butterflies and beetles, and is also seen in soap bubbles.

During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.

The speed of light in a vacuum does not depend on frequency (or wavelength).
When light travels through any medium other than a vacuum, its speed is lower than in the vacuum.
An electromagnetic wave transports its energy through a vacuum at a speed of 3.00 x 10⁸ m/s

Electromyography (EMG) is an electrodiagnostic medicine technique for evaluating and recording the electrical activity produced by skeletal muscles. EMG is performed using an instrument called an electromyograph to produce a record called an electromyogram.

Total internal reflection occurs only when light goes from a denser medium to a rarer medium.
Total internal reflection is the phenomenon which occurs when a propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.

Optical fibres works on the principle of total internal reflection.

Thermodynamics is the branch of physical science that deals with the relations between heat and other forms of energy and, by extension, of the relationships between all forms of energy.
Meteorology is a branch of the atmospheric sciences which includes atmospheric chemistry and atmospheric physics, with a major focus on weather forecasting.
Acoustics is the branch of physics concerned with the properties of sound.

Isaac Newton argued that the geometric nature of reflection and refraction of light could only be explained if light was made of particles, referred to as corpuscles, because waves do not tend to travel in straight lines.

Air has the lowest optical density.

Phosphorus P 32 – A radioactive form of the element phosphorus. It is used in the laboratory to label DNA and proteins. It has also been used to treat a blood disorder called polycythemia vera and certain types of leukemia, but it is not commonly used anymore. Phosphorus P 32 gives off radiation that damages the DNA in a cell, which can cause the cell to die.

Isotope used in radiation therapy for the treatment of cancer-Cobalt- 60 and Radium.

The phon is a unit of loudness level for pure tones. Its purpose is to compensate for the effect of frequency on the perceived loudness of tones.
Unit of
Frequency- Hertz
Electric charge- coulomb
Pressure- Pascal .

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