The optical resolution of microscope or a telescope tells us how close together, the two point sources of light can be so that they are still seen as two separate sources
Sharks due to their special organs, the "ampulae of lorenzini due to which they can detect the potential difference and can locate their prey very precisely of the order of
A spring balance is graduated at sea level. If the body is weighted with this balance at consecutively increasing heights form the earth's surface the weight indicated by the balance will
When an observer moves towards a stationary source with a speed equal to 1/5 timesof speed of sound,
the percentage increase in the frequency of sound is:
If a person with a spring balance and a body hanging from it goes up and up in an airplane then the reading of the weight of the body as indicated by the spring balance will
In the Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled the fringe width is
For total internal reflection to take place, the angle of incidence must be ______ than critical angle and the light should travel from ______ to ______ medium
A non-uniform beam of weight 50 N is 2 m long and is supported on a pivot situated in the exact middle of the beam. The centre of gravity of the beam is 0.5 m ot the right of the point where the pivot touches the beam. What weight has to be added to the left side of the beam so that the beam stays perfectly balanced (in equilibrium)?
The emf of a cell of negligible internal resistance is 2V. It is connected to the series
combination of 𝟐𝛀, 𝟑𝛀 𝐚𝐧𝐝 𝟓𝛀 resistance. The potential difference across 𝟑𝛀 resistance will be
in volt:
A body of mass 5 kg is moving with a momentum of 10 kg m/s.A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds.The increase in its kinetic energy is
