Top answers

Explain what is meant by specific latent heat of fusion

Specific latent heat of fusion is the energy (required) to change 1 kg / unit mass of material from the solid state to the liquid state or melt/fuse 
RJ
Answered by Rishi J. • Physics tutor
10667 Views

What name is given to the phenomena which results in longer wavelengths of light being observed from distant galaxies and why does this occur?

Red shift; this phenomena occurs as a result of the distant galaxies moving away from the Earth and all the wavelengths of electro-magnetic radiation being emitted are 'stretched' towards to the longer wavel...
WB
Answered by William B. • Physics tutor
2789 Views

Why are some electromagnetic waves harmful to humans?

Electromagnetic (EM) waves form the electromagnetic spectrum with a range of wavelengths. EM waves that have wavelengths shorter than those of visible light include ultraviolet light, X rays and gamma rays, ...
KH
Answered by Keval H. • Physics tutor
9279 Views

There is an oil tank that has a rectangular base of dimensions 2.4 m by 1.5 m. The tank is filled with oil of density 850 kg / m3 to a depth of 1.5 m. What is the mass of the oil?

2.4 1.5 1.5*850=4590kg
RJ
Answered by Rajiv J. • Physics tutor
4522 Views

I have an infinite number of glass blocks stacked side by side. The first block has refractive index n1, the second n2 and so on, such that n1<n2...<n(infinity). I shine a light on the stack, what angle does the ray make to the normal on the last block?

This question tests your knowledge of the behaviour of light through different mediums. We know that when light travels from air through glass, it tends towards the normal. This is because the glass is dense...
AC
Answered by Alex C. • Physics tutor
2336 Views