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  • Question 1
    4 / -1

    A broken ligament is being welded back in place using 20 ms pulses from a 0.5 W laser operating at a wavelength of 632 nm. The number of photons in 5 pulses of laser are

  • Question 2
    4 / -1

    A laser beam is used for carrying out surgery because it

  • Question 3
    4 / -1

    Which of the following is not the main characteristic of laser beam?

  • Question 4
    4 / -1

    In ruby laser, the stimulated emission is due to transition from

  • Question 5
    4 / -1

    A laser beam of pulse power 1012 W is focused on an object of area 10-4cm2. The energy flux in Watt cm-2. The energy flux in Watt cm-2 at the point of focus is

  • Question 6
    4 / -1

    A laser device produces amplification in the

  • Question 7
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    According to Hubble\'s law , the red-shift (z) of a receding galaxy and its distance r from earth are related as

  • Question 8
    4 / -1

    The velocity of a particle at which the kinetic energy is equal to its rest energy is

  • Question 9
    4 / -1

    Two electrons are moving in a opposite direction with speeds 0.8c and 0.4c, where c is the speed of light in vacuum. Then, the relative speed is about

  • Question 10
    4 / -1

    For a body moving with relativistic speed, if the velocity is doubled, then

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