Which materials should be used to make the outer case of the compass? a- magnetic material b- Non magnetic material
Non magnetic material ( glass or plastic)
If an atom has 5 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom? a) 5 neutrons b) 5 electrons c) 6 electrons.
b) 5 electrons
when we open a door slighty light enters across the edges. How is this related to wave interaction 1- Reflection 2- Refraction 3- Diffraction
3- Diffraction
These arrows represent the path of a wave during passing different media starting from air then water, so what is the third medium? Justify your answer.
It should be mirror so that the wave bounces back and reflects.
suggest how can you change a neutral atom of nitrogen to a negative ion of oxygen? a- Add one proton and one electron b- add one proton and remove one electron c-Remove one proton and one electron
a- Add one proton and one electron
Write a brief summary about disadvantages of non-renewable energy resources a) Air pollution b) Habitat Disruption c) Limited supply d) all of the above
d) all of the above
Which wave interaction needs different media? Justify your answer.
Refraction, because light bends as it passes between two different media with different speeds
The diagram shows Coal which is one of the energy resources. Suggest all possible ways you can do to identify the type of this energy resource.
- Check if it takes millions of years to be renewed then it is non-renewable energy resource - If it is easily renewed then it is renewable energy resource
why is a pencil attracted to pieces of paper after rubbing it with your hair
because the pencil and the hair have opposite charges
how can you turn the nail to be a magnet depending on their magnetic domains.
Rub the nail with the magnet so that all the domains are lined up in the same direction
Your experience on this site will be improved by allowing cookies.