Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. The star is moving at which fraction of the speed of light?
A) about 0.000003 (3 × 10?6 ) B) about 0.0003 (3 ×10?4 )
C) about 0.2 D) about 0.03 (3 × 10?2 )
B
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A container of ideal gas at STP undergoes an isothermal expansion and its entropy changes by 3.66 J/°K. How much work does it do?
What will be an ideal response?
At the time of a full moon, an astronaut on the Moon looking at Earth would see a
a. full Earth moon. b. first-quarter Earth moon. c. last-quarter Earth moon. d. new Earth moon.
Although protons repel each other at a distance, they will actually bind if they come close enough together
Indicate whether the statement is true or false
Latent Heats: Heat is added to a 3.0 kg piece of ice at a rate of 636.0 kW. How long will it take for the ice at 0.0°C to melt? For water LF = 334,000 J/kg and LV = 2.246 × 106 J/kg.
A. 1.6 s B. 640,000 s C. 0.0 s D. 1000 s