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The critical angle for a glass is 41 degrees. Calculate its refractive index.

Firstly we must remind ourselves of what is meant by critical angle. The critical angle is the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense med...
MS
Answered by Marnie S. • Physics tutor
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Why is the redshift important?

The redshift is an important piece of evidence for the big bang theory. If we look at the visible region on the electromagnetic wave spectrum, we will see there is red light on the left and there is violet o...
LC
Answered by Laxshana C. • Physics tutor
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Why is the nuclear model better than the plum pudding model of the atom?

The plum pudding model was the idea of a positively charged sphere, with negative electrons dotted within it as the model of an atom. easiest understood drawn out A scientist named Rutherford did an experime...
GH
Answered by Georgina H. • Physics tutor
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Why would you get an electric shock if you touched a wire?

Live wires are dangerous because they carry current to the appliance they're connected to, at very high voltages. This means the wire has a high potential voltage, whereas a human has zero potential voltage ...
GH
Answered by Georgina H. • Physics tutor
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The energy transferred from the water in the kettle to its surroundings in 2 hours is 46 200 J. The mass of water in the kettle is 0.50 kg. The specific heat capacity of water is 4200 J/kg °C. What is its temperature after 2 hours?

The water loses 4200 J/kg °C * 0.5 kg = 2100 J/°C As it's lost 46,200 J in total (regardless of the time it took for this to happen), it must have reduced in temperature by 46,200 J / 2100 J/°C = 22°C. Assum...
DB
Answered by Dewi B. • Physics tutor
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