Top answers

A light wave has a wavelength of 420nm, calculate the energy of this wave in joules.

E = hfE = energyh = planck's constant = 6.63 x 10 -34 f = wave frequency c = fλf = c/λ E = hc/λ c = 3.0 x 10 8 The speed of light which in this case is the speed of the wave.λ = 420 x 10 -9 As 1nm = 1 x 10 -...
ND
Answered by Nicholas D. • Physics tutor
7574 Views

Describe and explain the properties of graphene

Graphene has strong covalent bonds between the carbon molecules giving graphene properties such as a high melting point and making it very strong.Due to the delocalised electrons that are free to move across...
HC
Answered by Harry C. • Chemistry tutor
5377 Views

Describe the action of insulin for the control of blood glucose concentration

Insulin is made in the beta cells of the pancreas. They act on receptors on the target cells. This controls the uptake of glucose in the target cells by regulating the inclusion of channel proteins on the ta...
Answered by • Biology tutor
2693 Views

What is the founder effect? How can it influence the genetic profile of a population?

The founder effect occurs when a small number of individuals moves away from the main population, populate a new area, and found a new population. Two notable effects on the genetic profile of a founder popu...
LR
Answered by Leonie R. • Biology tutor
11007 Views

If (x+1) is a factor of 2x^3+21x^2+54x+35, fully factorise 2x^3+21x^2+54x+35

In order to find the other factors, we need to do polynomial division. We can do this by method of long division. We start by finding what we must times the x in (x+1) by to get the largest term of the polyn...
JG
Answered by Jennifer G. • Maths tutor
3710 Views