Numerical Problems | Chapter 18 Dawn Of The Modern Physics | 2nd Year Physics | KPK Boards | Hindi

The length of a spaceship is measured to be exactly one-third of its proper length. What is the speed of the space ship relative to the observer?
The time period of a pendulum is measured to be 3s in inertial frame of the pendulum. What is the period when measured by an observer moving with a speed of 0.95c with respect to the pendulum?
A metal, whose work function is 3.0eV, is illuminated by light of wavelength 3×〖10〗^(-7) m. Calculate the (a) threshold frequency, (b) maximum energy of photo-electrons and (c) stopping potential.
A 50KeV X-ray is scattered through an angle of 90°. What is the energy of X-ray after Compton Scattering?
The speed of electron is measured to be 5×〖10〗^(-3) 〖ms〗^(-1) to an accuracy of 0.003%. Find the uncertainty in determining the position of this electron.

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