Answer:
Radiation
Explanation:
There are three types of transfer of thermal energy:
- Conduction: conduction occurs when two objects/two substances are in contact with each other, and the warmer object transfers heat to the colder object through the collisions of the particles of the two objects. In this case, therefore, there is transfer of matter, so this is not the correct choice
- Convection: convection occurs in fluids. When a fluid is heated, the part of the fluid closer to the heat source gets warmer, becomes less dense and rises, replacing the colder part of fluid that sinks. Then, this part is heated, and the cycle goes on. In this type of heat transfer, there is transfer of matter, so this is not the correct choice.
- Radiation: radiation occurs when thermal energy is transferred through electromagnetic radiation. Since electromagnetic waves carry energy but not matter, in this type of heat transfer there is no overall transfer of matter. So, this is the correct answer.
Answer:
Electrons accelerated to high velocities travel in straight lines through an empty cathode ray tube and strike the glass wall of the tube, causing excited atoms to fluoresce or glow.
time taken by the object dropped = 2s
this time depends on the height of the plane from ground
it is given by
now the distance covered horizontally is given as 190 m
now the speed of the object is
now when plane is moving at same height but with double speed
so it will take same time to hit the ground again
so the time is given as
so it will take t = 2 s again to hit the ground
An electrical <span>current is </span>caused<span> by </span>flow<span> of free electrons from one atom to another. </span>
Answer:
Transverse wave
Explanation:
The wave is moving forwards from the hand to the point of attachment