The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?
a. 300 K
b. 100 K
c. 900,000,000 K
d. 90,000 K
e. 10,000 K
E
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An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?
A) -0.54 B) 0.54 C) -0.32 D) -0.22 E) 0.22
The voltage 8.00 sin (400t) is applied to a series RLC circuit, with R = 200 ?, L = 0.100 H, and C = 1.00 ?F. What are the impedance Z and the phase angle ??
a. 200 ?, ?37.0° b. 566 ?, +87.0° c. 2470 ?, ?85.4° d. 2540 ?, ?88.8° e. 393 ?, ?63.0°
Which of the following particles are leptons? (There may be more than one correct choice.)
A) protons B) neutrons C) electrons D) photons E) quarks
Given the equation 
, which answer or answers provide(s) the best description of a possible physical situation?
A. A 20.00-N tension pulls a 2.00-kg mass. The 2.00-kg mass pulls another 2.00-kg mass. B. A 20.00-N force pushes a 2.00-kg mass. The 2.00-kg mass pushes another 2.00-kg mass. C. A 2.00-kg mass on a flat surface is acted on by gravity while another 2.00-kg mass sits on top of it. D. All of the situations above are possible. E. Only (a) and (b) above are possible.