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Which Era is known as the era of invisible life?
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Which Era is known as the era of invisible life?
Precambrian is one of the four eras in earths geological history. Precambrian actually meant period before cambrian period of Palaeozoic era. Precambrian is divided into three periods- Azoic (no life), Archaeozoic (invisible life) and Proterozoic (age of early life).
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Which Era is known as the era of invisible life?



Era of Invisible Life

The era of invisible life is known as the Golden Age of Microbiology, which took place in the late 19th and early 20th centuries. During this period, significant advancements were made in the field of microbiology, leading to the discovery of various invisible microorganisms that play a crucial role in shaping our world.

The Microscopic World

Microorganisms such as bacteria, viruses, fungi, and protozoa were discovered during this era, challenging the traditional belief that only visible organisms could cause diseases. Scientists like Louis Pasteur, Robert Koch, and Anton van Leeuwenhoek made groundbreaking contributions to the field, revolutionizing our understanding of invisible life.

Germ Theory of Disease

One of the key developments during this era was the establishment of the germ theory of disease, which proposed that microorganisms are the cause of many infectious diseases. This theory paved the way for significant advancements in medicine, public health, and sanitation practices.

Impact on Society

The discoveries made during the era of invisible life had a profound impact on society. They led to the development of vaccines, antibiotics, and other medical interventions that have saved countless lives. Additionally, our understanding of microbiology has helped us improve food safety, water quality, and environmental health.

Conclusion

The era of invisible life was a transformative period in the history of science, laying the foundation for modern microbiology and revolutionizing our understanding of the microscopic world. The discoveries made during this era continue to influence various fields of study and have had a lasting impact on society as a whole.
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Read the following text and answer the following questions on the basis of the same:Laser:Electromagnetic radiation is a natural phenomenon found in almost all areas of daily life, from radio waves to sunlight to x-rays. Laser radiation – like all light – is also a form of electromagnetic radiation. Electromagnetic radiation that has a wavelength between 380 nm and 780 nm is visible to the human eye and is commonly referred to as light. At wavelengths longer than 780 nm, optical radiation is termed infrared (IR) and is invisible to the eye. At wavelengths shorter than 380 nm, optical radiation is termed ultraviolet (UV) and is also invisible to the eye. The term “laser light” refers to a much broader range of the electromagnetic spectrum that just the visible spectrum, anything between 150 nm up to 11000 nm (i.e. from the UV up to the far IR). The term laser is an acronym which stands for “light amplification by stimulated emission of radiation”.Einstein explained the stimulated emission. In an atom, electron may move to higher energy level by absorbing a photon. When the electron comes back to the lower energy level it releases the same photon. This is called spontaneous emission. This may also so happen that the excited electron absorbs another photon , releases two photons and returns to the lower energy state. This is known as stimulated emission.Laser emission is therefore a light emission whose energy is used, in lithotripsy, for targeting and ablating the stone inside human body organ.Apart from medical usage, laser is used for optical disk drive, printer, barcode reader etc.Q. What is the range of amplitude of LASER?

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Which Era is known as the era of invisible life?
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