On the Moon, the maria are younger than the highlands
a. True
b. False
Indicate whether the statement is true or false
True
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The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 106 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?
What will be an ideal response?
In a plane wave, the wavefronts are
a. circular. b. flat. c. parallel. d. perpendicular to the direction of propagation.
Motional Emf: A conducting rod whose length is ? = 1.60 m is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 4.00 ? as shown in the figure. The rails and the rod are in the plane of the page. A constant uniform magnetic field of strength 2.20 T is applied perpendicular to and out of the paper. What is the magnitude of the external applied force needed to move the rod to the right with a constant speed of 6.00 m/s?
A. 8.60 N B. 9.30 N C. 10.6 N D. 12.6 N E. 18.6 N
What is the wavelength of a photon emitted when an electron in hydrogen goes from the n = 4 state to the n = 1 state?
A. 323 nm B. 156 nm C. 121 nm D. 103 nm E. 97.3 nm