From laboratory measurements, we know that a particular spectral line is formed by the rotation of the carbon monoxide molecule (co) and it appears at a wavelength of 2.6007 millimeters (mm). the spectrum of an interstellar cloud of gas shows the same co line appearing at a wavelength of 2.6008 mm. what can we conclude about the gas cloud?

In a system, when potential energy decreases, then entropy also decreases. true false

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%