Top answers

Why do the muscles of the Iris contract and relax?

To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.
CM
Answered by Calum M. • Biology tutor
9734 Views

Which state can a substance NOT be in if heat transfer through convection is occurring?

Solid.
CM
Answered by Calum M. • Physics tutor
4020 Views

What are the advantages of franchising?

The franchisee will be buying into a established brand so there will be less risk of the business failing because they have a good repuattion and have a product which consumers will demand. They will benefit...
TC
4078 Views

Describe the photoelectric effect.

The photoelectric effect is a phenomenom which occurs when photons strike a metal causing electrons to be released from the metal atoms. This occurs because the photons transfer their energy to the electrons...
IW
Answered by Iman W. • Physics tutor
4518 Views

A table has diameter 130cm. What is the area, as a multiple of Pi

Since the diameter is 130cm, the radius is half of this, so it is 65cm Area is Pi radius 2 . This means the area is Pi (65cm) 2 This means the area is Pi*4225cm 2
JP
Answered by Jesse P. • Maths tutor
6878 Views