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  1. M

    Cathode rays

    dont they accelerate in the electric field???every charged particle in electric field is accelerated....then what and at what time is the velocity we calculate from above formula??
  2. M

    Do the photons have mass?

    do the photons have mas???or just the momentum???or both??
  3. M

    Cathode rays

    During discharge tube experiment, the cathode rays are emitted from cathode at very low is said that these rays move at very high velocity(if we apply high Potential Difference between 2 electrodes) these rays( stream of electrons) travel in uniform velocity or aren't they...
  4. M

    Sebeck's effect

    1.what is the main cause for the emf produced in a thermocouple when their two junctions are at different temperatures? 2.why is it necessary that the emf produced causes the current to pass from the metal (which is at the top of thermoelectric series) to the other metal (which is at lower...
  5. M

    Surface tension's direction

    what actually is surface tension??what is its direction?
  6. M

    Direction of frictional force in wheels

    so,in rolling friction,if a body is being accelerated,its frictional force always acts in the direction of acceleration(that may b -ve)/..but in uniform motion, the frictional force acts opposite to the motion of the rolling body..should i conclude like this?
  7. M

    Milky Way's Supermassive Black Hole to Light Up in 2013?

    actually,,,why doesn't the black hole form visible light rays while engulfing these dust?
  8. M

    Direction of frictional force in wheels

    how the direction of friction changes as the tyre slips?
  9. M

    Direction of frictional force in wheels

    1. if a ball rolling towards east frictional force also acts towards east...why is it so??(i mean to say doesnt frictional force act in opposite to the direction of motion?) 2. if a bicycle is being pedaled, then the frictional force acts in backward direction in the front wheels and in...
  10. M

    What is dark energy?

    but wont black holes(after many of them are formed in each galaxy) consume all the matters(/antimatters) of the universe to form the tiny condensed form of vast energy as it was before the big bang?isnt it possible?
  11. M

    About the nature of light

    why is light called an electromagnetic wave??what does it have to do with electricity and magnetism?
  12. M

    What is dark energy?

    Is the reverse of big bang that is big crunch likely to happen??or will dark energy dominate the gravity and the space will coninuoisly expand???