During the approach of a severe thunderstorm, workers on a project see lightning and then hear the resulting thunder 55 s later. Approximately how far away, in miles, is the storm?
a. 11 mi
b. 22 mi
c. 12 mi
d. 13 mi
a
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Nuclear fusion within the Sun proceeds step by step in a series of reactions called the neutron–neutron chain
a. True b. False Indicate whether the statement is true or false
What would Earth's average surface temperature be if it had no greenhouse effect?
A) below the freezing point of water B) slightly above the freezing point of water C) about 10°C D) the same temperature as it is with the greenhouse effect E) slightly warmer than it is with the greenhouse effect
Which part of the electromagnetic spectrum is the ozone-destruction problem related to?
A) visible B) X-rays C) radio D) infrared E) ultraviolet
An ultraviolet light beam having a wavelength of 217 nm is incident on a molybdenum surface with work function of 4.9 eV. What is the stopping potential? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.6 × 10^?19 J, and 1 nm = 10?9 m)
a. 10.6 V b. 5.3 V c. 0.8 V d. 0.4 V e. 5.7 V