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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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
Today, Mars has virtually no magnetic field
Indicate whether the statement is true or false
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
To minimize heat loss it is best that a teapot be
A) black. B) silver. C) depends on size, not color