Physics Past Questions and Answers

In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of 17cm. If the velocity of the sound wave is 340ms<sup style='font-size: smaller;'>-1</sup>. Determine the frequency

Light of wavelength 5000 x 10<sup style='font-size: smaller;'>-8</sup>cm travels in free space with a velocity of 3 x 10<sup style='font-size: smaller;'>8</sup>ms<sup style='font-size: smaller;'>-1</sup>. What is its wavelength in glass of refractive index 1.5?

The magnification of the image of an object placed in front of a convex mirror is \(\frac{1}{3}\). If the radius of curvature of the mirror is 24cm, what is the distance between its object and its image?

The plane mirrors in a kaleidoscope are usually placed

A far sighted person cannot see objects that are less than 100cm away. If this person wants to read a book at 25cm, what type and focal length of lens does he need?