2000 - WAEC Physics Past Questions and Answers - page 5

An inductor of inductance 10H carries a current of 0.2A. Calculate the energy stored in the inductor

calculate the inductance of an inductor whose reactance is one ohm at 50 Hz.

Borh's theory provides evidence for the

A nuclide ${}_{84}^{202}Y$ emits in succession an $\alpha -particle$ and a $\beta -particle$. The atomic number of the resulting nuclide is

The half life of a radioactive substance is 14 days. If 48g of this substance is stored, after how many days will 1.5g of the original substance remain?

A material of mass 1.0 x 10^-2kg undergoes a fission process which decreases its mass by 0.02 percent. Calculate the amount of energy released in the process. (c = 3.0 x 10⁸ms^-1)

Absorption line spectra exhibited by atoms is a result of

In which of the following transitions is the largest quantum of energy liberated by an hydrogen atom when the electron changes energy levels? [n is the quantum number]

A proton of wavelength ${\lambda }_o$ is emitted when an electron in an atom makes a transition from a level of energy 2E. If the electron transits from $\frac{4}{3}{E}_k$ to E level, determine the wavelength of the photon that would be emitted

The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?