Doppler effect is the apparent change in frequency when there is a relative motion between the source and the observe. As the source approaches As the source moves away or recedes V is the speed of sound Vs is the sped of the source Fs is the frequency of …

Read More »## Notes on Direct Current for Cambridge A level and UTME

Direct current : flow of charges in the circuit is in the same direction all the time from higher potential to lower potential. Appropriate circuit symbol switch 2. Cell, voltmeter, ammeter, resistor, variable resistor etc Circuit diagram Kirchhoff’s First Law: The sum of the currents entering a junction is always …

Read More »## How to solve questions on Work, Energy and Power

Question 1 A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision. What is the approximate average force that acts on the nail while it moves through 5.0 mm?{ Cambridge …

Read More »## Short note on work, energy and power for Students

Workdone by a force is defined as the product of the force and the distance moved in the direction of the force. W = F x s F is the force s is the displacement in the direction of the force w is the workdone the unit of workdone is …

Read More »## How to solve to some UTME Physics past questions

All the questions below are UTME past questions Questions 1 – 5 are from 2013 UTME Question 1 The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle of 300 with the resultant, find its magnitude A. 25.0N …

Read More »## How to solve questions on stationary waves, diffraction and interference

Question 1 A parallel beam of light of wavelength 450 nm is incident normally on a diffraction grating which has 300 lines / mm. What is the total number of intensity maxima observed?{ Cambridge A level may/jun 2016 p11) A 7 B 8 …

Read More »## Stationary waves, diffraction and interference

Stationary waves, diffraction and interference Principle of superposition The Principle of Superposition states that when two or more waves meet at a point, the resultant displacement at that point is equal to the sum of the displacements of the individual waves at that point. For constructive interfernce: the resultant displacement …

Read More »## How to solve questions on current of electricity for Cambridge A level

Question 1 A heater is made from a wire of resistance 18.0 Ω and is connected to a power supply of 240 V. The heater is switched on for 2.60 Ms.{Cambridge A level 2013 p22} Calculate (i) the power transformed in the heater, (ii) the current in the heater, (iii) …

Read More »## Notes on current of Electricity for Cambridge A level and UTME

Current of Electricity Electric charge Q passing a point is defined as the product of the (steady) current at that point and the time for which the current flows. Q = It Q = ne I is the current t is the time taken When charges flow, there is electric …

Read More »## How to solve questions on wave motion

Q1 Given the progressive wave equation{UTME 2008} calculate the wavelength. A. 12.4m B. 15.7m C. 17.5m …

Read More »