The hydrogen atoms are excited to the stationary state designated by the principal quantum number n=4, the number of maximum spectral lines are observe:
Between the plates of a parallel plate condenser there is 1mm thick paper of dielectric constant 4. Itis
charged at 100 volt. The electric field in volt/meter between the plates of the capacitor is:
An engine pumps up 100 kg of water through a height of 10m in 5s. Given that the efficiency of the engine is 60%, what is the power of the engine? (Take g = 10ms-2)
You lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2 m. In this process
you take 5 seconds. The work done by you will depend upon:
A man M1 of mass 80 kg runs up a staircase in 15s. Another man M2 also of mass 80 kg runs up the same staircase in 20s. The ratio of the power developed by them will be
A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be:
