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In a lab a hydrogen spectral line is observed to have a wavelength of 656nm. This line is observed in a distance galaxy to have a wavelength of 661nm, what is the recessional velocity of the galaxy?

This question is dealing with phenomena of Redshift, where wavelengths are shifted due to movement between observer and event. The key information to extract from the question is we have a rest wavelength...

Answered by Jamie M. • Physics tutor

4880 Views

How should I approach independent-research coursework essays?

Firstly, the text you choose to base your independent research on is very important. You should always choose one that you will enjoy analysing, one that definitely interacts with your chosen theory and o...

Answered by Wendy M. • English Literature tutor

3282 Views

What is mitosis?

Mitosis is the DNA replication stage in somatic cells (non sex cells). It involves replication of DNA and ONE division of DNA to produce two genetically identical daughter cells. The stages specific to mi...

Answered by Selina N. • Biology tutor

3157 Views

There are n sweets in a bag. 6 of them are orange, the rest are yellow. Hannah takes a random sweet, she eats the sweet and repeats again. The probability that hannah eats two orange sweets is 1/3. Show that n2 - n - 90 = 0.

The best way to think approach question is thinking of it like a tree diagram.We know there are n sweets in total. Therefore the probability of eating 1 orange sweet the first time is 6/n.The probability ...

Answered by Selina N. • Maths tutor

2853 Views