Whether you remember it as "Roy G. Biv" or "Richard Of York Gave Battle In Vain" the seven colours of the rainbow are Red, Orange, Yellow, Green, Blue, Indigo and Violet. We've got Newton to blame for this. When he split white light with a prism in the 17th Century he originally saw five colours, then added the final two so there were seven in total – like the seven musical notes and days of the week.
Ultrasound waves have a frequency above 20,000Hz.Ultrasound waves have a frequency below 20Hz.Ultrasound waves have a wavelength above 20,000Hz.Ultrasound waves have a wavelength below 20Hz.
Sound waves have a frequency between 20 and 20,000Hz, so ultrasound is greater than that upper limit.
The diagram shows 1.5 wavelengths of the wave, so divide the total length by 3 and multiply it by 2 to get the final answer.
Electric current is the rate of flow of charge.
It's measured in Coulombs per second, and the unit is Amps.
white dwarf then black hole.neutron star then white dwarf.red giant then supernova.red giant then white dwarf.
The sun will expand into a red giant in about 5 billion years, then shrink back down to a white dwarf to live out its days. If it was around 50% bigger it would end up as a black hole instead.
transverse waves only.electromagnetic waves only.both transverse and electromagnetic waves.both transverse and longitudinal waves.
Transverse and longitudinal.
Earthquakes trigger primary and secondary waves, known as P- and S-waves. P-waves are compressional and longitudinal and S-waves are shear and transverse.
Becquerel or Bq.
One Bq is defined as the activity of a quantity of radioactive material in which one nucleus decays per second.
A variable resistor allows you to alter the flow of current in a circuit continually.
600 kg m/s
Momentum is equal to mass multiplied by velocity.
zero.greater than the driving force.smaller than the driving force.the same size as the driving force.
The same size.
When the velocity is constant the object is not accelerating, so the forces on it are balanced.
Power is the rate of transfer of energy.
The atomic number of an atom is equal to the number of protons in its nucleus. And in a neutral atom the number of electrons is equal to the number of protons.
0ºC is 273K. So 23ºC in Kelvin is 273+23=296K.
X-rays with higher frequencies have more energy.
When a wave changes direction because of a change in its transmission medium it's called refraction.
Would You Pass School Physics Right Now?
You probably wouldn't pass GCSE Physics today, but who cares? You have better things to do anyway.
You'd have probably just made it through, and a pass is a pass, so don't sweat it.
Not bad at all! You'd pass GCSE Physics today.
Well done! You'd pass with a good mark.
Congratulations! You'd be a straight-A student. Keep up the good work.
Congratulations! You'd be top of the class. Keep being amazing.