1) 1 2) 2 3) 3 4) √3/2 Answer: (3) 3 Solution: tan 20° tan 40° tan 60° tan 80° = [(2 sin 20° sin 40° sin 80°)/ (2 cos 20° cos 40°... View Article
The time period of a system is the measure of time. The time period is the time it takes for an oscillating system to complete a cycle. Period... View Article
A motion in which the body moves to and fro repeatedly is known as an oscillation. The motion of a table fan is considered an oscillatory motion... View Article
Boiling water is both conduction and convection. Heat from the heat source is transferred to the water from the bottom of the container through... View Article
The impulse-momentum theorem states that the change in momentum of an object equals the impulse applied to it. The impulse-momentum theorem... View Article
A shunt resistance is connected in parallel to the galvanometer so as to keep the resistance low. Such low resistance galvanometer is used in... View Article
Semiconductors are materials that act as insulators at low temperatures, and at high temperatures they conduct both heat and electricity.... View Article
Doppler shift is the apparent change in the pitch of sound. Light from distant stars and galaxies is shifted in the same way. Since red is at the... View Article
The flowing liquid metal in the outer core of the planet generates electric current. The rotation of Earth on its axis results in these electric... View Article
When the magnet is moved away from the coil, the galvanometer shows deflection in the opposite direction indicating that the direction of the... View Article
Coulomb’s law signifies the inverse square dependence of electric force. The law is also used in the derivations of Gauss' law for general cases... View Article
