PLEASE HELP AND HURRY IM FOING A TEST Right now Gamma rays and X-rays are both high-energy forms of radiation that can penetrate the
skin. X-rays, however, are the chosen form of radiation used to take pictures inside our
bodies. Which of the following is a reasonable explanation for the use of X-rays over
gamma rays when taking images?

A The energy and intensity of X-rays can be controlled.|
B X-rays have higher energy than gamma rays.
C The energy and intensity of gamma rays can be controlled.
D Gamma rays have higher energy than X-rays.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

Which of the following can enter and exit a closed system? a. matter and energy b. neither energy nor matter c. matter but not energy d. enrgy but not matter

Which of these best describes the term ecliptic? a. the circle where "earth meets the sky" b. the change in azimuth and altitude of an object c. the point directly above the geographic north pole d. the path of the sun through the constellations of the zodiac