Define a prototype metre

Why is platinum iridium alloy used in making prototype metre and kilogram ?

Internatinal prototype of the kilogram is made up of

Define metre.

Which of the following is the first working prototype of the Internet?

Define standard metre in terms of the wavelength of light.

Define standard metre in terms of velocity of light.

Statement I : Lomash Rishi and Sudama caves in the Barabar Hills, modelled on wooden architectural prototypes. are examples of the earliest cave architecture in India. Statement II : Barabar Hills caves were dedicated by Chandragupta Maurya to Ajivika monks.

Define one parsec. Express it in terms of metres.