What element has a K? line with wavelength 1.46 × 10-11 m?
A) Protactinium B) Niobium C) Uranium D) Zirconium
C
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Which statement about Jupiter is true?
A. It is more massive than all other planets combined. B. It may become a star in about a billion years. C. It is the least dense of the Giant Planets. D. It has a solid core of ice about 1,000 km under the visible surface.
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s)
A) 6.7 × 1015 B) 8.8 × 1015 C) 1.1 × 1016 D) 1.3 × 1016
Saturn has fewer, but stronger winds than Jupiter
a. True b. False Indicate whether the statement is true or false
A 2.0-kg block situated on a frictionless incline is connected to a light spring (k = 100 N/m), as shown. The block is released from rest when the spring is unstretched. The pulley is frictionless and has negligible mass. What is the speed of the block when it has moved 0.20 m down the plane?
A. 76 cm/s B. 68 cm/s C. 60 cm/s D. 82 cm/s E. 57 cm/s