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State and explain how the attraction between nuclei and outermost electrons varies across group 3 (2 marks)

Attraction between the nucleus and the outer electrons increases across a group because the proton number increases and the atomic radius decreases due to increased nuclear charge.Across a group shielding...

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Answered by Amy D. Chemistry tutor
10120 Views

To what extent was the legacy Treaty of Versailles the main cause of the Second World War?

Thesis - The legacy and impact of the Treaty of Versailles was the main cause of the WWII, since it set the precedent for a following conflict. Despite this, the failure of collective security, the econom...

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Answered by Vinicius S. History tutor
1772 Views

Why does anaerobic respiration have a lower ATP yield than aerobic respiration? (4 marks)

During anaerobic respiration only glycolysis can occur as oxygen is not present to act as the final electron acceptor in oxidative phosphorylation, therefore only substrate level phosphorylation can occur...

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Answered by Amy D. Biology tutor
8087 Views

Calculate the threshold wavelength for a metal surface with work function of 6.2 eV.

threshold wavelength where photoelectrons have no energy, i.e. Work function = hc/wavelength.Rearrange for wavelength and substitute. Wavelength = 2*10^-7 m.

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Answered by Daniel P. Physics tutor
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Outline the action of B lymphocytes following initial contact with an antigen or antigen presenting cell. (6 marks)

There are 4 stages to the response of B lymphocytes upon contact with antigens. These are antigen presentation, clonal selection, clonal expansion and differentiation. During antigen presentation the lymp...

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Answered by Amy D. Biology tutor
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