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THE KIMS COLLEGE (CHINIOT)
Test # 8 2
nd
year physics Chapter # 19
1. State Stephen Boltzmann’s law.
2. Calculate wave length of a 140 g ball moving at 40 m/s.
3. What are the measurements on which two observers in relative motion will always agree
upon?
4. As a solid is heated and begins to glow, why does it first appear red?
5. What happens to total radiation from a black body if its absolute temperature is
doubled?
6. A beam of red light and a beam of blue light have exactly the same energy. Which beam
contains the greater number of photons?
7. Which photon, red, green, or blue carries the most (a) energy and (b) momentum?
8. Which has the lower energy quanta? Radio-waves or X-rays.
9. Does the brightness of a beam of light primarily depends on the frequency of
photons or on the number of photons?
10. Will bright light eject more electrons from a metal surface than dimmer light of the same
colour?
11. Will higher frequency light eject greater number of electrons than low frequency
light?
12. Why can red light be used in a photographic dark room when developing films, but a blue or
white light cannot?
13. Photon ‘A’ has twice the energy of photon ‘B’. What is the ratio of the momentum
of ‘A’ to that of ‘B’?
14. Can pair production take place in vacuum? Explain
15. Is it possible to create a single electron from energy? Explain
THE KIMS COLLEGE (CHINIOT)
Test # 8 2
nd
year physics Chapter # 19
1. State Stephen Boltzmann’s law.
2. Calculate wave length of a 140 g ball moving at 40 m/s.
3. What are the measurements on which two observers in relative motion will always agree
upon?
4. As a solid is heated and begins to glow, why does it first appear red?
5. What happens to total radiation from a black body if its absolute temperature is
doubled?
6. A beam of red light and a beam of blue light have exactly the same energy. Which beam
contains the greater number of photons?
7. Which photon, red, green, or blue carries the most (a) energy and (b) momentum?
8. Which has the lower energy quanta? Radio-waves or X-rays.
9. Does the brightness of a beam of light primarily depends on the frequency of
photons or on the number of photons?
10. Will bright light eject more electrons from a metal surface than dimmer light of the same
colour?
11. Will higher frequency light eject greater number of electrons than low frequency
light?
12. Why can red light be used in a photographic dark room when developing films, but a blue or
white light cannot?
13. Photon ‘A’ has twice the energy of photon ‘B’. What is the ratio of the momentum
of ‘A’ to that of ‘B’?
14. Can pair production take place in vacuum? Explain
15. Is it possible to create a single electron from energy? Explain

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