Govt. Exams
Entrance 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
The mirror equation relates object distance, image distance, and focal length to locate where an image forms in a concave mirror.
For this concave mirror problem, we extract the known measurements from the question.
The mirror equation relates these three quantities and allows us to solve for the unknown image distance.
Substituting the values:
Since v is positive, the image forms in front of the mirror (on the same side as the object).
The image is formed 15 cm in front of the mirror. Answer: (B)
