Which of the following products of ratios gives the conversion factors to convert meters per second 
to miles per hour 
?
A.
B.
C.
D.
E.
Answer: D
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Why are the Balmer lines weak in the spectra of hot and cool stars, but strong in the spectra of intermediate-temperature stars?
What will be an ideal response?
An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T,
directed at an angle of 60° to the +x-axis and lying in the xy-plane. (1 eV = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg) Calculate the magnitude of (a) the magnetic force on the electron. (b) the acceleration of the electron.
An infinitely long cylinder of radius R = 2 cm carries a uniform charge density ? = 18 ?C/ m3. Calculate the electric field at distance r = 1 cm from the axis of the cylinder
A) 2.5 × 103 N/C B) 5.1 × 103 N/C C) 0 D) 2.0 × 103 N/C E) 10.2 × 103 N/C
How many elements have been identified?
a. 92 b. 104 c. 114 d. over 200 e. none of the above