Who discovered radium?
a. Marie and Pierre Curie
b. Ernest Rutherford
c. Henri Becquerel
d. Niels Bohr
a
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What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 8 jumps to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 205 nm B) 104 nm C) 389 nm D) 486 nm E) 610 nm
Hot steam that issues from a pressure cooker expands and
A) increases in temperature. B) can cause severe burns. C) cools. D) all of the above E) none of the above
According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic flux through the circuit
A) True B) False
The International Astronomical Union established 88 constellations that represent a defined area of the sky
a. True b. False Indicate whether the statement is true or false