4.A signal travels from point A to point B. At point A, the signal power is 20 W. At point B, the power is 5 W. 4.1. What is the attenuation in dB? (No score if not show solution)
4.2. What is the attenuation in dBm? (No score if not show solution)
4.3. In case attenuation of a signal is -50 dB. What is the final signal power ? (No score if not show solution)

answer: when the substance contain the two parts (polar and non-polar) like soap.

explanation:

soap is produced from the basic hydrolysis of ester "saponification", it is considered as a salt of hydrocarbons. the soap molecule contains the two parts: a polar group   (-coo-na+) and a non-polar group (r-hydrocarbon part). the polar group is called the head and the tail is the non-polar group. the polar group is hydrophilic in nature (water loving) and the non-polar group is hydrophobic in nature (water repelling).the polar/non-polar nature of a substance is useful that it can dissolve the non-polar substances by the polar part and also can dissolve the polar substances by the non-polar part. it commonly used in detergents and soaps.

Kpa - known-plaintext attack

Answer the important painting of the baptism of the christ, leonardo painted the kneeling angel and some of the background for this;