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प्रश्न
An electron emitter must have _____________ work function and ___________ melting point.
उत्तर
An electron emitter must have low work function and high melting point.
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संबंधित प्रश्न
Define 1 J of work.
State the S.I. unit of energy.
Differentiate between energy and power.
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Name the physical quantity whose SI unit is Nm.
Give two examples of couple action in our daily life.
Can every force produce work?
A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
List any six forms of energy and write a short note on each of them.
Fill in the boxe to show the corresponding energy transformation.
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
