Which of the following is the symbol for an alkali metal?
a. Al
b. Cl
c. K
d. Ca
c
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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 )
Parallel light incident on a positive lens will ________ as it emerges.
Fill in the blank(s) with the appropriate word(s).
A uniform beam having a mass of 60 kg and a length of 2.8 m is held in place at its lower end by a pin. Its upper end leans against a vertical frictionless wall as shown in the figure. What is the magnitude of the force the pin exerts on the beam?
A. 0.68 kN B. 0.57 kN C. 0.74 kN D. 0.63 kN E. 0.35 kN
The first law of thermodynamics is basically a special version of the law of ______________
Fill in the blank(s) with correct word