Which of these statements is true for the image formed by spherical mirror?
A. real images of real objects are always inverted
B. virtual images of real objects are always in front of the mirror
C. virtual images of real objects are always upright
D. real images are always in back of the mirror
C. virtual images of real objects are always upright
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Fluorescence is the decay of an excited state is less than _________ seconds with the emission of a photon.
Fill in the blank(s) with the appropriate word(s).
Resistivity and Temperature: A carbon resistor has a resistance of 18 ? at a temperature of 20°C. What is its resistance at a temperature of 120°C? The temperature coefficient of resistivity for carbon is -5.0 × 10-4/C°.
A. 18 ? B. 17 ? C. 16 ? D. 15 ?
The ideal efficiency for a heat engine operating between the temperatures of 227°C and 27°C is
A) 20%. B) 25%. C) 40%. D) 88%. E) none of the above
A starship "Alpha" travels at 0.8c past an identical starship, "Beta," which is at rest. Both an engineer on the "Alpha" and a scientist on the "Beta" measure the length of the other ship as it passes by. Who measures the longer length?
A. The scientist B. Both measure the same length C. The engineer D. The measured lengths cannot be compared