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Find the period of a wave given that it has a speed of 200m/s and a wavelength of 2m

The equation for finding the period of the wave is the reciprocal of the frequency hence th eperiod T =1/f substitute this into the wave speed equation v=f x lambda solve for f f = v/ lambda f= 200/ 2 f= 100...
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Answered by Zubaydah J. • Physics tutor
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Why are transformers used in the National Grid?

The National Grid is how electricity is distributed from suppliers to consumers (commercial or private household). Power stations produce power in the region of Mega Watts (the order of millions of watts) an...
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Answered by Mike R. • Physics tutor
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A photon has an energy of 1.0 MeV. Calculate the frequency associated with this photon energy. State an appropriate unit in your answer.

The energy contained in a photon is given by the formula E = hf, where h is the Planck constant and f is the frequency of the photon. Since h = 4.1 10 −15 eV s, f = E/h = 1.0 10 3 eV / (4.1 10 −15 eV s) = 2....
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Answered by Giovanni N. • Physics tutor
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What is the angular velocity of a car wheel which diameter is d = 15 mm if the car velocity is of 120 km/h?

First, we change the units of the datas: v=120 km/h = 120 km/h x 1 h / 3600 s x 1000 m /1 km = 33.333 m / s d=15 mm = 15x10 -3 m Using the formula of the angular velocity: w=v/r = 33.33 m/s / 15x10 -3 m= 222...
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Answered by Lucia A. • Physics tutor
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What is the second law of thermodynamics?

Formally speaking, the definition required in an exam would be that the second law of thermodynamics states that the entropy of an isolated system never decreases. The second law was conceived with the conce...
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Answered by Lucas B. • Physics tutor
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