Recent questions in Physics

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An X-ray operates at 30000V and the current through it is 2mA. Given that the charge of an electron is 1.6 x 10-19C, h = 6.63 x 10-34JS, speed of light, C = 3.0 x 108m/s, calculate:-

asked Jul 8, 2021 in Physics Form 4 by anonymous

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State two advantages of using a Cathode Ray Oscilloscope (C.R.O) as a voltmeter over the ordinary voltmeter.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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Sodium has a work function of 2.3eV. Given that: Planck’s constant h = 6.63 x 10-34JS, velocity of light in vacuum, C = 3.0 x 108m/s, 1 electron-volt (1eV) = 1.6 x 10-19 C and mass of an electron, me = 9.1 x 10-31kg, calculate:

asked Jul 8, 2021 in Physics Form 4 by anonymous

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State one factor which affects the rate of each of the above types of emission.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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Distinguish between thermionic emission and photoelectric emission.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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Explain how energy losses in a transformer are reduced by having:

asked Jul 8, 2021 in Physics Form 4 by anonymous

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A transformer has 800 turns in the primary and 40 turns in the secondary winding. The alternating e.m.f connected to the primary is 240V and the current is 0.5A

asked Jul 8, 2021 in Physics Form 4 by anonymous

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A bar magnet is moved into a coil of insulated copper wire connected to a centre-zero galvanometer, as shown in the figure below.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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State Lenz’s a law of electromagnetic induction.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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An object is placed 40cm in front of a concave lens of focal length 20cm; determine the position of the image.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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The diagram below shows a certain defect of vision. Name the defect.

asked Jul 8, 2021 in Physics Form 1 by anonymous

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What do you understand by the term accommodation?

asked Jul 8, 2021 in Physics Form 1 by anonymous

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The critical angle of a certain material medium is 43.2º. Determine the refractive index of the material.

asked Jul 8, 2021 in Physics Form 1 by anonymous

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Define refractive index.

asked Jul 8, 2021 in Physics Form 1 by anonymous

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You are given three resistors of values 5Ω, 8Ω and 12Ω. Show in a circuit diagram how you would connect them so as to give:

asked Jul 8, 2021 in Physics Form 4 by anonymous

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A current-carrying conductor AB is in a magnetic field as shown in the figure below.

asked Jul 8, 2021 in Physics Form 2 by anonymous

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State how polarization is minimized in a simple cell.

asked Jul 8, 2021 in Physics Form 1 by anonymous

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What do you understand by polarization as used in a simple cell?

asked Jul 7, 2021 in Physics Form 1 by anonymous

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A girl standing at a distance claps her hands and hears an echo from a tall building 2 seconds later. If the speed of sound in air is 340m/s, determine how far the building is.

asked Jul 7, 2021 in Physics Form 3 by anonymous

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The figure below shows a block diagram of a p-n junction diode.

asked Jul 7, 2021 in Physics Form 4 by anonymous

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