Because angular momentum must be conserved, as a gas cloud contracts, it will also

Question

BlackTom AI · Accepted Answer

When considering how angular momentum behaves in a contracting gas cloud, the key idea is that angular momentum is conserved in the absence of external torques. 
Option: 'spin slower.' This is inconsistent with conservation of angular momentum; if the cloud contracts and there is no external braking, it cannot slow its spin while preserving angular momentum. 
Option: 'become more electrically charge.' Charge is not determined by mechanical contraction or angular momentum conservation in this context; contraction changes velocity and moment of inertia, not net electric charge. 
Option: 'spin faster.' As the cloud’s radius decreases, its moment of inertia drops, and to conserve angular momentum, its rotational speed must increase. This is the classic figure skater effect and is the correct consequence of the conservation principle. 
Option: 'emit shorter wavelength light.' The emission of radiation and its wavelength is not dictated directly by angular momentum conservation in this scenario; contraction could affect temperature and emission spectra, but this option does not follow from the stated principle alone. 
Option: 'decrease in temperature.' While contraction can affect temperature through compression and heating processes, angular momentum conservation does not imply a temperature decrease as a general rule; in fact, contraction often leads to heating unless cooling processes dominate. So this statement is not a direct consequence of angular momentum conservation.

In summary, only the idea that the cloud spins faster upon contraction aligns with the conservation of angular momentum, while the other options misapply or misconstrue how conservation laws relate to rotation, charge, radiation, or temperature in this context.

Because angular momentum must be conserved, as a gas cloud contracts, it will also单项选择题

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