Question

I have read that holes insemiconductorare nothing but vacancies created by electrons. But how can this vacancy i.e. hole has a mass?

Answer 1

this is a english question i am hindi medium student

Answer 2

Answer:

A camera is an optical instrument used to record images. ... The word camera comes from camera obscura, which means "dark chamber" and is the Latin name of the original device for projecting an image of external reality onto a flat surface