Groombridge 34 is an M1 V star. Based on this information, which of the following are true? I. Groombridge 34 has a surface temperature that is less than the Sun. II. Groombridge 34 has a mass that is greater than that of the Sun. III. Groombridge 34 is less luminous than the Sun. IV. Groombridge 34 is located near the middle of the H-R diagram
a. I & II
b. II & IV
c. I & IV
d. I & III
e. II & III
d
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A nucleus of radium-223 undergoes alpha decay. (a) Write the reaction equation and (b) determine the identity of the daughter nucleus
The product of one ______________ and one meter is one joule
Fill in the blank(s) with correct word
The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be __________ times the change in length of the Pyrex glass rod
Fill in the blank(s) with correct word
An object is placed at the focal point of a converging lens and the light rays from the lens will be parallel to the principal axis. The object is now moved closer to the lens. Which statement is true about the light rays from the lens?
A. the will remain parallel to the principle axis B. they converge toward each other C. they emerge parallel to each other but not the principle axis D. they diverge from each other