Things he should do
1) Take several readings.
2) And find the average of the readings to get the accurate value.
Things should not do
1) Avoid human error.
2) Zero error
Answer:
c They can only travel without a medium.
Explanation:
Electromagnetic waves are made up of electric field and magnetic field.
Here electric field will induce magnetic field and magnetic field will induce electric field.
So this type of field do not require any medium and in vacuum or air the speed of electromagnetic waves are same as speed of light
also we have different range of electromagnetic waves out of which a small range of electromagnetic waves is of visible region in which these waves are visible to us.
so correct answer is
c They can only travel without a medium.
Answer:
The acrylic rod gains a net negative charge by coming in contact with the hard rubber rod. This is because when brought in contact with the rubber rod some of the excess electrons which are responsible for the negative charge on the rubber rod gets deposited on the acrylic material. Electrons generally will be deposited more on a body where there is more space to accommodate them. So the magnitude of charge that gets deposited on the acrylic material depends on the free sites available to the incoming electrons.
Explanation:
When the rubber rod is scrapped the net charge on the rubber rod changes to positive or negative depending on if it is gaining or loosing electrons. The act scrapping happens because of friction and friction causes transfer of charges between two different materials. The material that loses electronic gains a net positive charge and the material that accepts gains a net negative charge.
