Engineering Physics I Practice Test 8

1. A particle with a lifetime of 2 X 10^-6 s moves through the laboratory with a speed of 0.9 c. It’s lifetime, as measured by an observer in the laboratory, is ___________

2. In Michaelson interferometer, the position of mirror read 0.6025mm and 0.8970mm for a pair of consecutive bright. Mean wavelength of light is 5393 Å. The difference between the two wavelengths is ___

3. A wave transmits momentum. Can’t it transfer angular momentum?

4. When a particle is moving with a velocity of light c relative to S, its velocity as observed by an observer in the frame S^’ is _____________

5. What will be the rest energy of an electron?

6. The momentum of a photon having energy 1.00 X 10^-17 J is ____________

7. Two particles approach each other with a speed 0.8 c with respect to the laboratory. Their relative speed is ___________

8. What is the other name for ultrasonic flaw detector?

9. If the direction of velocity is changed by 180o simultaneously, the mass would _____________

10. The Kinetic energy of a photoelectron emitted on shining a light of wavelength 6.2 X 10^-6 m on a metal surface of work function 0.1 eV is _________________