The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (R = 1.097 × 10^7 m?1 and 1 nm = 10?9 m)
a. 91.4 nm
b. 122 nm
c. 273 nm
d. 456 nm
b
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A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is 8 minutes
a. True b. False Indicate whether the statement is true or false
What is meant by ‘like charges?'
a. charges that are both positive b. equal amounts of charge c. charges that are both negative d. A and C
"Time-of-day" pricing of electricity could help to
A) reduce the need for new power plants by encouraging users to use less electric energy. B) reduce the need for new power plants by encouraging users to use electric energy at less popular times. C) reduce the nation's appetite for chocolate fudge. D) reduce total electric energy use by encouraging users to use electric energy at less popular times. E) reduce total electric energy use by encouraging users to use less electric energy.
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 3, when it is undergoing radiative contraction and its life track moves up and to the left?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.