Questions

Most medieval music was instrumental.

The law of demand implies that "The higher the price of a good, the lesser the quantity demanded".

For example:

If the rate of a mobile phone increased, the quantity demanded by the customers is decreased.

Demography is the scientific study of Birth and death, The well being and the Growth of population. In brief, it is the study of human populations based on their size, composition and distribution across space – and the process through which populations change.

The first computers used vacuum tubes for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms.

The photoelectric effect pointed to the particle properties of light, which had been considered to be a wave phenomenon. Particles like electron and protons have both particle like and wave like behavior. Thus, according to de Broglie, all the material particles in motion possess wave characteristics. Although the dual nature of matter is applicable to all material objects but it is significant for microscopic bodies only.

Deck of Cards are what we cut, mix and serve when we are playing with them.