Compared to the underlying photosphere and chromosphere, the corona is ________ in temperature
Fill in the blank(s) with correct word
much hotter
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Uncertainty Principle Using Energy and Time: The energy released when an unstable electron state decays has an uncertainty of about 0.50 eV. What is the uncertainty in the life-time of the level? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 1.3 × 10-15 s B. 8.3 × 10-15 s C. 1.3 × 10-11 s D. 8.3 × 10-11 s
If we could observe a spacecraft actually traveling past us at the speed of light, we would measure its mass to be
A) zero B) slightly greater C) infinite D) the same as at rest
In 20 minutes, Kara ran 2.40 km on a treadmill facing due east. Relative to the gym, what were her displacement and average velocity during this time interval?
a. 0; 0 b. 0; 2.00 m/s c. 2.40 km, east; 0 d. 2.40 km, east; 2.00 m/s, east e. 2.40 km, west; 2.00 m/s, west
Watch dials contain radium glow because
A. all radioactivity creates light B. batteries supply energy when a button is pushed C. the radiation hits a phosphor D. They don't glow. Only tritium glows.