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E=hf, so as you increase the frequency of light, the energy of each photon hitting the metal surface is greater. Thus the electrons liberated from the surface of the metal have a greater maximum kinetic e...

This question is assessing your knowledge of units and their conversion. Notice that the area units of the roll of card and the postcard are different, so it is important that before we carry out any calc...

The perfect and imperfect tenses are both used to describe the past, but in different situations. The perfect tense is used to describe a completed action in the past, for example, what you did this morni...

Gorbachev oversaw a period of dramatic structural political, social and economic reform between the middle of the 1980s to 1991. His limited attempts to liberalise the Soviet Union’s economy led to signif...

The most important fact to remember with this question is that two perpendicular straight lines have gradients related by m₁ = -1/m_2. This can then be used to find the gradient of t...