In beta decay, it is found that the energy of the emitted electrons varies and is always less than what is calculated on the basis of the parent and daughter nuclei. This is evidence for the existence of another particle called the
A) gluon.
B) meson.
C) neutrino.
D) quark.
E) positrons.
C
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Which of the following statements regarding the H-R diagrams of star clusters is NOT correct?
A. A very young cluster will have stars that lie in the right-hand side and a little above the main sequence. B. A very young cluster will not show a turn-off point. C. A very old cluster will have many stars in the upper left corner of the H-R diagram. D. A very old cluster will show a turn-off point and will have many red and yellow giant stars. E. A very young cluster will not have all its stars on the main sequence.
Planet X-39 has a mass equal to 1/3 that of Earth and a radius equal to 1/3 that of Earth. If V is the escape speed for Earth, what is the escape speed for X-39?
A) V B) 3V C) 6V D) V/9 E) 9V
Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?
a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one
CH3CH2OH is the structural formula for the compound named ______________
Fill in the blank(s) with correct word