This might be stupid but I need an answer. Newton's second law stated that the force exerted on a body equals the mass of the body times the acceleration of the body. And the law of gravitation states that: $$F = G\frac{m_1m_2}{r^2}$$ My question is: if I take two identical masses and place on...

What actually is conduction band?I have just started learning semiconductors and this is the very first concept I am troubled with.Is this continuous energy level of all the free electrons or something else?If they are, then is forbidden energy gap equal to ionisation energy?As ionisation energy ...

Where does the mass coming from when neutrons are produced from protons in the Sun?....If a positron is made will it annihilate possibly with an nearby electron?

Description of the system Assume two point masses one at the point $C$ and the other on the circumference of the circle with radius $R$. They are attracting one another gravitationally and no external forces are acting on them. The point mass at C has very large mass such that it is at the COM...

Generally, the (Heisenberg) uncertainty principle is stated as: $\Delta x \cdot \Delta p \geq \dfrac{\hbar}{2}$ But sometimes you also encounter a variant of it, placing limits on other entities, such as $\Delta E \cdot \Delta t \geq \dfrac{\hbar}{2}$. These are the two versions I can find onlin...