physics

The diagram below represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m. Calculate the speed of the wave.

A. 128ms-1 B. 192ms-1 C. 384ms-1 D. 768ms-1 E. 1536ms-1 Correct Answer: Option D - 768ms-1

5 years ago

What is the decay constant of a radioactive element whose half-life is 3 seconds?

A. 0.132s-1 B. 0.23s-1 C. 0.347s-1 D. 0.693s-1 E. 0.924s-1 Correct Answer: Option B - 0.23s-1

5 years ago

The resistance in a series R-C circuit is 5 Ω. If the impedance of the circuit is 13 Ω . Calculate the reactance of the capacitor?

A. 65 Ω B. 18 Ω C. 16 Ω D. 14 Ω E. 12 Ω Correct Answer: Option E -…

5 years ago

ln the diagram below, the resistor has a resistance 8 Ω while the reactance of the inductor and the capacitor are 10 Ω and 16 Ω respectively. Calculate the current in the circuit

A. 3.6A B. 3.8A C. 9.2A D. 10.0A E. 13.0A Correct Answer: Option E - 13.0A

5 years ago

Calculate the amount of heat generated in an external load of resistance 89 if an alternating current of peak value 5A is passed through for 100s.

A. 20,000J B. 10,000J C. 5,000J D. 4,000J E. 200J Correct Answer: Option A - 20,000J

5 years ago

The diagram below illustrates a variation of the displacement y of a wave-particle with time t. lf the velocity of wave is 250ms-1. Calculate the distance between two successive particles which are in phase

A. 20m B. 2.5m C. 3.0m D. 5.0m E. 50.0m Correct Answer: Option B - 2.5m

5 years ago

How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash?

The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who…

5 years ago

The distance between two successive crests of a water is 1m. lf a particle on the surface of the water makes two complete vertical oscillations in 1 second. Calculate the speed of the wave

A. 0.5 ms-1 B. 1.0 ms-1 C. 2.0ms-1 D. 3.0ms-1 E. 4.0ms-1 Correct Answer: Option C - 2.0ms-1

5 years ago

A string of length 1.0 m vibrates in 10 loops. If the total mass of the string is 1.0 x 10−³ kg and the tension in it is 10N, calculate the frequency of the vibration.

A. 50Hz B. 100Hz C. 250Hz D. 400Hz E. 500Hz Correct Answer: Option A - 50Hz

5 years ago

The walls and ceilings of many standard auditoria are covered with perforated pads to?

A. increase the intensity of sound waves B. increase the loudness of sound waves C. reduce the effect of reverberations…

5 years ago
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