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Photon energy is the energy carried by a single photon. The amount of energy is directly proportional to the photon’s electromagnetic frequency and thus, equivalently, is inversely proportional to the wavelength. The higher the photon’s frequency, the higher its energy.

A gamma ray, or gamma radiation, is a penetrating electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves and so imparts the highest photon energy.

A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer’s current position.

A microscope is an instrument used to see objects that are too small to be seen by the naked eye.

The reason it appears red is because it reflects red colour and absorbs the rest. Hence when green light is shone on it, it absorbs all of the green light and not reflecting anything. Hence, it appears black.

Nuclear fuel is the fuel that is used in a nuclear reactor to sustain a nuclear chain reaction. These fuels are fissile, and the most common nuclear fuels are the radioactive metals uranium-235 and plutonium-239.

Petroleum is a naturally occurring liquid found beneath the Earth’s surface that can be refined into fuel. Petroleum is a fossil fuel, meaning that it has been created by the decomposition of organic matter over millions of years. It is formed in sedimentary rock under intense heat and pressure.

It is refined and separated, most easily by distillation, into numerous consumer products, from gasoline (petrol) and kerosene to asphalt and chemical reagents used to make plastics, pesticides and pharmaceuticals.

Generally the food bacteria don’t grow at lower temperature, they need room temperature or temperature more than 15 degrees for growth. This is the basic reason why vegetables and fruit remains fresh in refrigerator for few days.

Peristalsis is a series of wave-like muscle contractions that moves food to different processing stations in the digestive tract.
The process of peristalsis begins in the esophagus when a bolus of food is swallowed.
Peristalsis is a radially symmetrical contraction and relaxation of muscles that propagates in a wave down a tube, in an anterograde direction.
Peristalsis is progression of coordinated contraction of involuntary circular muscles, which is preceded by a simultaneous contraction of the longitudinal muscle and relaxation of the circular muscle in the lining of the gut.
Earthworms use a similar mechanism to drive their locomotion.

Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth.

The heart of an amphibian, such as a frog, has three chambers, one ventricle and two atria. Blood from the ventricle travels to the lungs and skin where it is oxygenated and also to the body. In the ventricle deoxygenated and oxygenated blood are mixed before being pumped out of the heart.

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