Demand refers to how much
(quantity) of a product or service is desired by
buyers. The quantity demanded is the amount of
a product people are willing to buy at a certain
price; the relationship between price and
quantity demanded is known as the demand
relationship. So for demand to originate, a
product is required first.
ভাষা ও ভাষার উৎপত্তি
Plasma Physics (প্লাজমা পদার্থবিদ্যা)
Laser (লেজার)
Quantum materials (কোয়ান্টাম উপকরণ)
Particle physics (কণা পদার্থবিজ্ঞান)
Optics (অপটিক্স এবং ফোটোনিক্স)