Which is smaller?
A) a local group
B) a local supercluster
Answer: A
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The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0
30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope? A) -320 x B) -470 x C) -240 x D) -300 x E) -190 x
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. What will be an ideal response?
Equation of Traveling Waves: What are the wavelength (in meters) and frequency (in hertz) of a wave whose displacement is given by the equation y = 0.5 sin(0.20x + 120t), where x and y are in meters and t is in seconds?
A. 10 m, 0.50 Hz
B. 5.0 m, 10 Hz
C. 19 m, 120 Hz
D. 31 m, 19 Hz
E. 0.20 m, 120 
Hz
The detectors on the Spitzer Space Telescope were cooled to near absolute zero in order to:
A) allow the electronics in these instruments to operate most efficiently. B) keep the telescope more nearly stationary. C) prevent the infrared radiation from the instruments interfering with the infrared signals from space. D) improve the angular resolution of the telescope.