Process of Science: In the discovery of quasars, the radio source 3C273 was found to have strong emission lines at wavelengths that did not correspond to any known element on Earth
Suppose a scientist postulated that they had discovered a new element that only existed in these powerful radio sources. How would you test this?
You would expect to see the same lines in other galaxies or radio sources like 3C273. (This is not seen—instead, a similar pattern of lines is seen but shifted in wavelength.)
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A 45-kg person steps on a scale in an elevator. The scale reads 460 N. What is the elevator doing?
What will be an ideal response?
125 g of dry ice (solid CO2) is dropped into a beaker containing 600 g of 64.0°C water. The dry ice converts directly to gas, leaving the solution. When the dry ice is gone, the final temperature of the water is 33.2°C. What is the heat of vaporization of solid CO2? (cwater = 1.00 cal/g/°C)
a. 160 cal/g b. 142 cal/g c. 118 cal/g d. 148 cal/g e. 154 cal/g
A telescope is constructed with two lenses separated by a distance of 25 cm. The focal length of the objective is 20 cm. The focal length of the eyepiece is 5 cm. Calculate the magnitude of the angular magnification of the telescope
a. 6 b. 4 c. 8 d. 10 e. 5
The joule
a)is a unit in the British system b)can be used as a unit for either work or energy. c) is a unit of power. d) can only be used to designate mechanical kinetic energy.