The element helium was discovered by studying the sun's spectrum
Indicate whether the statement is true or false
T
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Which of the following statements is true of white dwarfs?
A) Some of them are among the hottest stars known. B) Few of them are positioned in the upper-right corner of the Hertzsprung-Russell (H-R) diagram. C) They have high luminosities. D) They have a very big surface area from which they radiate energy.
An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 mT. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.
Identifying Groups and Periods Which elements have similar behavior?
a. barium b. silicon c. aluminum d. strontium e. osmium f. beryllium
What is the main process by which heat flows upward through the lithosphere?
A) conduction B) convection C) radiation D) accretion E) differentiation