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What is the Doppler effect and how is it exploited in everyday life?

The Doppler effect describes the changes in a wave's frequency (or wavelength) as the source of the wave moves towards/ away from the observer (you). You have almost definitely experienced this phenomenon be...
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Answered by Abin V. • Physics tutor
10699 Views

What happens to a primary secondary and tertiary alcohol when an excess solution of Potassium Dichromate is added under acidic conditions, state the chemical formula of potassium dichromate?

pottasium dichromate (K 2 SO 4 ) is an example of an oxidising reagent. If added to a primary alcohol, under reflux, carboxcylic acid will form, a secondray alcohol will form a ketone and if aded to tertiary...
CS
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Explain the difference between tidal volume and total vital capacity. Under what circumstances would each occur?

Tidal volume is the normal volume of air inhaled in one breath at rest. Total vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation. This usually occurs whe...
JB
Answered by Jemma B. • Biology tutor
24903 Views

How do I ensure that I answer the question but also reveal how much knowledge I have acquired through revision and practice?

When you have invested a lot of time and energy into your revision, it is understandable that you want to convey this to your examiner. The way to do this is not, however, by setting down as much information...
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Answered by Francis B. • English tutor
2419 Views

Frank, Mary and Seth shared some sweets in the ratio 4:5:7. Seth got 18 more sweets than Frank. Work out the total number of sweets they shared.

The ratio 4:5:7 is a way of comparing the size of the shares received by Frank, Mary and Seth. It helps to pretend that we are sharing the sweets between some equally-sized boxes: each box has the same numbe...
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Answered by Richard N. • Maths tutor
30812 Views