1995 - WAEC Physics Past Questions and Answers - page 4

A sound note of frequency 250 Hz and wavelength 1.3m is produced at a point near a hill. If the echo of the sound is received 1 second later at the point, how far away is the hill from the point?

The period of a wave is 0.02 second. Calculate its wavelength if its speed is 330 ms^-1

An alternating voltage with a frequency of 50Hz has a period of

A listener can detect the instrument from which a note is being sounded because different instruments produce the same note with a different.

What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)

A charge of 1.6 x 10^-10C is placed in a uniform electric field of intensity 2.0 x 10⁵NC^-1. What is the magnitude of the electric force exerted on the charge?

A balloon containing 546cm³ of air is heated from 0^oC to 10^oC. If the pressure is kept constant, what will be its volume at 10^oC?

Calculate the inductance L of the coil in the circuit shown below.

Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015C placed in air of permittivity (Take 1/4πε_o as 9.0 x 10⁹ Nm²C²)

Calculate the inductive reactance of the circuit shown above.