Category: Physics

What is the first natural element? It used to be believed that of the first 92 elements on the periodic table (1 is hydrogen and 92 is uranium) that 90 elements occur naturally….List of the Natural Elements. Element Name Symbol Erbium Er Europium Eu Fluorine F Francium Fr What elements Cannot be found in nature? […]

Are A and B Hermitian? For A and B hermitian operators, show that AB is hermitian if and only if A and B commute. but for hermitian operators, the RHS is BA which is equal to the LHS only when 0 = AB − BA = [A,B]. Do two Hermitian operators commute? In classical mechanics […]

Which of the following is not a amorphous solid? Quartz glass (SiO2) is an amorphous solid due to its short range order of constituent particles. Note Quartz is a crystalline solid while quartz glass is an amorphous solid. This discussion on Which among the following is not an example of amorphous solids? a)Quartzb)Plasticc)Glassd)CokeCorrect answer is […]

What happen when air heats up? What happens when air is heated or cooled? So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward. This is the concept used […]

Should you always remember when handling microscope slides? When you hold a microscope slide, you should never hold the slide in the center. Why? Because if you hold it in the center, the slide will get dirty and the specimen that you will put on that slide might get dirt or when you look at […]

What is the atomic number of H+? It is a member of atomic nucleus, a monoatomic hydrogen, a monoatomic monocation and a monovalent inorganic cation. Stable elementary particles having the smallest known positive charge, found in the nuclei of all elements….4.3Related Element. Element Name Hydrogen Atomic Number 1 What is the name of H+? In […]

What is another name for a port on routers? Often the router ports are called the router interface, the physical connection where the router connects to the network. Which 4 wires are used in cat5? These are just a few and it depends on the brand you buy. The four wire pairs in a CAT-5 […]

Can Sea breezes occur at night? The opposite of a sea breeze is a land breeze. While sea breezes occur during the day, land breezes occur at night. Do valley breezes occur at night? When the valley floor warms during the day, warm air rises up the slopes of surrounding mountains and hills to create […]

Is friction force always present? Friction always acts to oppose any relative motion between surfaces. For the simple example of a book resting on a flat table, the frictional force is zero. There is no force trying to move the book across the table, so there is no need for a frictional force because there […]

How do we usually think of voltage as the cause and current as the effect? Voltage is the Cause, Current is the Effect Voltage attempts to make a current flow, and current will flow if the circuit is complete. Voltage is sometimes described as the ‘push’ or ‘force’ of the electricity, it isn’t really a […]