Govt Exams
Temperature is a scalar quantity as it has only magnitude. Displacement, velocity, and acceleration are vector quantities as they have both magnitude and direction.
Lorentz force F = q(v × B). When v is parallel to B, the cross product is zero, so no force acts
Blue light has shorter wavelength and is scattered more by atmospheric molecules (Rayleigh scattering)
Resistance R = ρL/A. When length doubles, L becomes 2L and area becomes A/2 (volume constant). New R = ρ(2L)/(A/2) = 4ρL/A = 4R
The azimuthal quantum number (l) determines the shape of the orbital (s, p, d, f)
When object is between lens and focus (u < f), a convex lens produces virtual, erect, magnified image
Young's modulus Y = Stress/Strain = (F/A)/(ΔL/L), a measure of material stiffness
In elastic collisions, both momentum and kinetic energy are conserved
After 3 half-lives (30 years), the fraction remaining = (1/2)³ = 1/8
Air has a refractive index of approximately 1, which is the lowest among common materials