Physics Past Questions and Answers

Heat transfer by convection in a liquid is due to the

The distance between two successive crests of a wave is 15cm and the velocity 300ms^-1. Calculate the frequency.

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill?

An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.

The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at