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Describe what is meant by photoperiodism

A response controlled by relative light and dark periods. The name of the receptors responsible for absorbing light are phytochromes. The photoperiodic stimulus is detected by the leaves of the plant.
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Answered by Amy O. • Biology tutor
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Explain why the second ionisation energy of boron is higher than the first ionisation energy of boron.

Boron is the 5th element in the periodic table, and has an electron configuration 1s 2 2s 2 2p 1 . The first ionization energy of Boron is the energy required to remove the single 2p electron, while the seco...
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Answered by Adelina I. • Chemistry tutor
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What is the difference between Functionalism and Marxism?

Functionalism is a consensus perspective, therefore theorists such as Durkheim view society to be based on harmony and all of the societal institutions complementing one and other to contribute to social sol...
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Answered by Lolade A. • Sociology tutor
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Prove the identity: sin^2(x)+cos^2(x) = 1

This is one of the most commonly used A level identities which can be proved using only GCSE maths! Firstly, take an arbitrary right angle triangle with Hypotenuse h, and angle x between h and the adjacent s...
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Answered by Sean O. • Maths tutor
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If the highest frequency a song is 10 kHz and it is encoded at 16 bits per sample what is the minimum number of bytes needed to encode the 3 minute song?

The key to this question is to remember the Nyquist rate of a signal. This is the lowest sample rate which can be used for a signal without losing valid frequencies or gaining incorrect frequencies. This is ...
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Answered by David M. • Physics tutor
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