As a result of annihilation of electron and positron, number of γ–ray (Gama ray) photons are: ________?

Related Mcqs:

1. In addition to the daughter nucleus and an electron or positron, the products of a beta decay

   A. Neutrons B. Neutrino C. Alpha particle D. Proton Submitted by: Alina Malik...

2. When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?

   A. a straight line parallel to the field B. a parabola in a plane perpendicular to the field C. a circle in a plane perpendicular to the field D. a straight line along its initial direction...

3. For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?

   A. 107m/sec B. Should be greater than the speed of light. C. Be zero D. Not be wave-like...

4. In bringing an electron towards the second electron, the electrostatic potential energy of the system

   A. Decreases B. increases C. remains the same D. becomes zero Submitted by: Tauseef Ali...

5. A transmitting station emits radio waves of wavelength λ at power P. If h is Planck’s constant & c the speed of light what is the rate of emission of photons ?

   A. λ B. Speed of sound C. Speed of lightB. D. h...

6. In normal state of energy the incident high energy photons will be______________?

   A. Stimulated B. Absorbed C. Cause X-ray emission D. Cause laser production...

7. The linear momentum of an X-ray photon of wavelength 0.1A is_______________?

   A. 6.625x1023N-s B. 66.25x1023N-s C. 662.5x1023N-s D. data is insufficient...

8. X-ray are________________?

   A. of unknown nature B. high energy electrons C. high energy photons D. radio isotopes...

9. In obtaining an X-ray photograph of our hand we use the principle of______________?

   A. photo electric effect B. ionization C. shadow photograph D. any of above...

10. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?

    A. he/ev B. he/Vc C. eV/h D. impossible to predict...