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When light above the threshold frequency of a metal is shone on the metal, photoelectrons are emitted. If the power of the light halves, are the maximum kinetic energy of the photoelectrons and/or the number of photoelectrons altered, and if so, how?

When the power of the light is halved, there are half as many photons per unit time. Therefore, the number of photoelectrons emitted is also halved. The maximum kinetic energy of the photoelectrons depends o...
SS
Answered by Sam S. • Physics tutor
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Show that the recurring decimal 0.13636... can be written as the fraction 3/22

First of all, identify how many digits are recurring in the decimal, in this case it's two: 0.1 36 36...Let x = 0.1363636...Since there are two digits recurring we use 100x = 13.63636... (if it is 1 digit we...
VC
Answered by Vanessa C. • Maths tutor
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Discuss possible economic implications of an ageing population (6 marks)

An ageing population refers to the increase in the average age of citizens, as citizens tend to live longer, and the subsequent increase in numbers of elderly people is not balanced by an increase in the bir...
LH
Answered by Laura H. • Geography tutor
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How do I construct an effective argument in an exam essay?

When writing an exam essay the most important thing is not to rush in. Read the question carefully and make sure you understand its nuances. Take a few minutes to think of what points you can raise in respon...
ER
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What is conformity? Identify two factors that might affect conformity.

Conformity is a change in behaviour due to the presence of others: the individual starts to exhibit the same behaviour or opinions as others. It is more likely to occur with a bigger percentage of a group ex...
TD
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