Govt Exams
Refractive index n = c/v. Therefore, v = c/n = (3 × 10⁸)/1.5 = 2 × 10⁸ m/s.
Chlorine (Cl) has atomic number 17, with electronic configuration 2, 8, 7 (K-shell: 2, L-shell: 8, M-shell: 7).
First convert 72 km/h = 20 m/s. Using v = u + at: 0 = 20 + a(8), so a = -20/8 = -2.5 m/s². Magnitude of deceleration is 2.5 m/s².
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
The force on a current-carrying conductor in a magnetic field is called the Lorentz force, given by F = BIL
Using transformer equation Vs/Vp = Ns/Np, we get Vs = 220 × (100/500) = 44 V
Using mirror formula 1/f = 1/u + 1/v, where f = -10 cm, u = -30 cm, we get v = -15 cm (behind mirror)