How do regions showing strong radio emission from molecules look in the infrared-light image? Are they bright or are they dark?
What will be an ideal response?
Regions with strong radio emissions are dark in the infrared-light image. (Note: students may find this a bit difficult to see at the scale shown in the images, but the darkest infrared regions clearly correspond to strong radio emissions.)
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The decay constant of neptunium-239 is 0.2975 d-1. What are its (a) half-life and (b) mean life?
What will be an ideal response?
Newton concluded that a force from the Earth had to act on the Moon because
a. a force is needed to keep the Moon in motion in its orbit. b. a force is needed to pull the Moon outward. c. a force is needed to accelerate the Moon toward Earth away from straight-line motion. d. the Moon moved at a constant velocity in a straight line. e. All of the other choices are correct.
Find the frequencies of the first three harmonics of a 1.0-m long string which has a mass per unit length of 2.0 × 10^?3 kg/m and a tension of 80 N when both ends are fixed in place
Spiral galaxies have more gas, dust, and younger stars than elliptical galaxies do
Indicate whether the statement is true or false