Ernest Rutherford
A) observed back-scattering from nuclei.
B) discovered radium and polonium.
C) proposed the tiny central nucleus idea.
D) invented the particle detector tube.
E) proposed the plum-pudding model.
C
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What is the total mass of the Earth's atmosphere? The radius of the Earth is 6.4 × 106 m, and 1 atm = 1.01 × 105 N/m2.
A. 5.3 × 1016 kg B. 1.1 × 1018 kg C. 5.3 × 1018 kg D. 1.1 × 1020 kg E. 5.3 × 109 kg
Today, Mars has virtually no magnetic field
Indicate whether the statement is true or false
To minimize heat loss it is best that a teapot be
A) black. B) silver. C) depends on size, not color
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. Where is the final image formed?
A) 25 cm in front of the second lens B) 8 cm in front of the second lens C) 8 cm after the second lens D) 10 cm after the second lens E) 25 cm after the second lens