Reverberation is the persistence of sound in a particular space after the original sound is produced.A reverberation, or reverb, is created when a sound is produced in an enclosed space causing a large number of echoes to build up and then slowly decay as the sound is absorbed by the walls and air. This is most noticeable when the sound source stops but the reflections continue, decreasing in amplitude, until they can no longer be heard. The length of this sound decay, or reverberation time, receives special consideration in the architectural design of large chambers, which need to have specific reverberation times to achieve optimum performance for their intended activity. In comparison to a distinct echo that is 50 to 100 ms after the initial sound, reverberation is many thousands of echoes that arrive in very quick succession (.01 – 1 ms between echoes). As time passes, the volume of the many echoes is reduced until the echoes cannot be heard at all.

16. speed of light is 300 million meters per second
21. A vaccum does not conduct electricity

liquid nitrogen boils at −196 °C (77 K; −321 °F)
Liquid nitrogen freezes at 63 K (−210 °C; −346 °F)

Boiling an egg is and is not a chemical change, depending on how you are chemically defining the egg.

Some chemicals inside the egg will undergo various chemical reactions, driven by the heat of the boiling. These reactions will involve the formation of new chemicals with new empirical formulas and the destruction of old ones.

Other chemicals, particularly proteins, will undergo changes in their conformation or secondary and tertiary structures. While their empirical formulas will remain unchanged (or largely unchanged), the new structures may have different chemical properties than the old ones.

The only way in which the egg does not undergo a chemical change is if you are referring to the empirical formula of the egg as a whole. No atoms leave or enter the egg, so the atomic composition of the egg remains unchanged.

In chemistry, pH is a measure of the activity of the (solvated) hydrogen ion. p[H], which measures the hydrogen ion concentration, is closely related to, and is often written as, Pure water has a pH very close to 7 at 25 °C. Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline. The pH scale is traceable to a set of standard solutions whose pH is established by international agreement.Primary pH standard values are determined using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. Measurement of pH for aqueous solutions can be done with a glass electrode and a pH meter, or using indicators.

Traditional ceramic raw materials include clay minerals such as kaolinite, whereas more recent materials include aluminium oxide, more commonly known as alumina. The modern ceramic materials, which are classified as advanced ceramics, include silicon carbide and tungsten carbide. Both are valued for their abrasion resistance, and hence find use in applications such as the wear plates of crushing equipment in mining operations. Advanced ceramics are also used in the medicine, electrical and electronics industries.

A ceramic is an inorganic, nonmetallic solid prepared by the action of heat and subsequent cooling. Ceramic materials may have a crystalline or partly crystalline structure, or may be amorphous (e.g., a glass). Because most common ceramics are crystalline, the definition of ceramic is often restricted to inorganic crystalline materials, as opposed to the noncrystalline glasses, a distinction followed here.

A polyamide is a polymer containing monomers of amides joined by peptide bonds. They can occur both naturally and artificially, examples being proteins, such as wool and silk, and can be made artificially through step-growth polymerization or solid-phase synthesis, examples being nylons, aramids, and sodium poly(aspartate). Polyamides are commonly used in textiles, automotives, carpet and sportswear due to their extreme durability and strength.

Sir wont the answe of part 33 paper 2011 be C
Computer can add subtract and classify information... only.

The cytoplasm comprises cytosol — the gel-like substance enclosed within the cell membrane — and the organelles — the cell's internal sub-structures, including (in eukaryote cells) the nucleus.

Sir can one answer all these questions by studying Everday Science by MIRZA?
please

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