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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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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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Outline what is meant by the term ‘validity’ in psychology. What problems may psychologists have when they attempt to make their studies high in validity?

We can talk about two types of validity in psychology. The first is external validity, which means the extent to which the results and findings of the study can be generalized to real life. The second, inter...
TD
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Briefly outline Milgram's study on obedience (6 marks)

The aim of Milgram's study was to investigate the effect of an authority figure on behaviour. Milgram had the naive participant meet with the confederate and gave them a rigged draw so that the naive partici...
BD
Answered by Billie D. • Psychology tutor
25037 Views

What are the functions of glycoproteins in the plasma membrane ?

Glycoproteins have a range of functions and are used in the recognition of different cell types by cells. Cell signalling also involves glycoproteins whereby they act as receptors or binding sites for hormon...
JT
Answered by Jonathan T. • Biology tutor
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