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A hydrogen atom is in the ground state. It absorbs energy and makes a transition to the n = 3excited state. The atom returns to the ground state by emitting two photons. What are their wavelengths? ? m (lowest energy photon) ? m (highest energy photon)
A worker lifts a 10 kilogram block a vertical height of 2 meters. The work he does on the block is: a) 5 Joules b) 20 Joules c) 49 Joules d) 200 Joules Ans:
Friction has several disadvantages but life is impossible without friction because friction has many benefits also.
Armature core: It houses the armature conductors or coils and causes them to rotate and as cuts the magnetic flux of field magnets. It also gives a path of very low reluctanc
There are thousands of insulating materials available in the market. Insulations technology is one of the few branches where the number of materials is very large. Any special requ
Illustrate the formation of stationary waves in stretched strings and thus deduce the laws of transverse waves in stretched string.
x-ray and e ray
What is quantisation of electric charge?
A football player kicks a field goal from a distance of 45 m from the goalpost. The football is launched at a 35° angle above the horizontal. What initial velocity is neede
Question: Portray is a principal ray for the case of a concave lens. Where does it depart from here? Ans: In the situation of a diverging lens there is a ray that
COLLISION: "When two or more bodies come close to each other, so that there is some part of interaction among them, with or without the presence of external force, we say tha
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