A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?
A) 16 cm B) 30 cm C) -30 cm D) 6.8 cm E) -16 cm
B
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Hydrogen, both in neutral and in molecular form, can be used to map out features of the Galaxy through its emission of 21-cm radiation.
Answer the following statement true (T) or false (F)
A battery stores electric charge in the same way that a bottle stores water
a. True b. False Indicate whether the statement is true or false
At what frequency should a 200-turn, flat coil of cross sectional area of 300 cm2 be rotated in a uniform 30-mT magnetic field to have a maximum value of the induced emf equal to 8.0 V?
a. 7.5 Hz b. 7.1 Hz c. 8.0 Hz d. 8.4 Hz e. 16 Hz
Which occurrence is associated with the demise of the dinosaurs?
a. The Great Dying b. The Cambrian explosion c. The breakup of Pangaea d. The K-T event