Advertisements
Advertisements
प्रश्न
An electron emitter must have _____________ work function and ___________ melting point.
Advertisements
उत्तर
An electron emitter must have low work function and high melting point.
APPEARS IN
संबंधित प्रश्न
Why is a jack screw provided with a long arm?
How is work related to energy?
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
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.
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
A ______ should act on an object.
