Which factor can lead to a shorter EMR wavelength emitted from an object?

A higher temperature of an object results in a shorter electromagnetic radiation (EMR) wavelength emitted from that object due to the principles of blackbody radiation. According to Wien's displacement law, as the temperature of an object increases, the peak wavelength at which it emits electromagnetic energy shifts to shorter wavelengths. This concept is fundamental in understanding how objects of different temperatures emit EMR differently.

For instance, a hot object like a star emits radiation primarily in the visible or even ultraviolet spectrum, whereas a cooler object will emit in the infrared spectrum. Therefore, the connection between temperature and wavelength reveals that increasing the temperature of an object leads directly to a decrease in the wavelength of the EMR it emits.

Other factors such as altitude, visibility, and atmospheric pressure do not have a direct influence on the wavelength of EMR emitted by an object in the same way that temperature does. Lower altitude might alter atmospheric conditions but does not affect an object's thermal radiation properties. Increased visibility relates to clarity in observation rather than the physical emissions of EMR, and more atmospheric pressure primarily influences the behavior of electromagnetic waves traveling through the atmosphere, not their intrinsic wavelength emissions.