Top answers

Ultrasound is used to scan unborn babies but X-rays are not used to scan unborn babies.

Ultrasound is not ionising as it is a longitudinal wave whilst X-rays are ionising as they are transverse waves and have very high frequency hence can 'knock' electrons out of their orbit. Doing this can cau...
SA
Answered by Saram A. • Physics tutor
13278 Views

How many fission event occur per second if a Uranium 235 Nuclear Reactor outputs 210MW of energy? Average Binding Energy per Nucleon of Uranium 235- 7.6 MeV Average Binding Energy per Nucleon of Products-8.5 MeV

Binding Energy is the Energy released or used when an Atom is formed or broken respectively Difference in Binding Energy = 0.9 Mev 235 nucleons in 1 atom of Uranium235 x 0.9 Mev = 211.5 MeV per Event 210 MW ...
OM
Answered by Oliver M. • Physics tutor
3427 Views

Explain why the velocity of a car moving at a constant speed around a bend changes.

Velocity is a vector quantity, that is, it is fully described by magnitude and direction. Even though the car moves at a constant speed, its direction varies as it moves around the bend. Since there is a cha...
NA
Answered by Nicholas A. • Physics tutor
12586 Views

Determine an approximate value for the acceleration of free fall using a tennis ball, metre ruler and a stopwatch.

Drop the ball from a given height that is measured with the ruler and measure the time it takes for it to reach the ground using the stopwatch. Use the appropriate SUVAT equation of motion: we have a height ...
VN
Answered by Viktoria N. • Physics tutor
12211 Views

State the life cycle of a star about the same size of our sun

Nebula (cloud of gas and dust)ProtostarMain sequence starRed giantWhite dwarfBlack dwarf (some students may not need to know this depending on their GCSE exam board and specification)
GC
Answered by Grace C. • Physics tutor
2362 Views