Physics · Dawn of Modern Physics
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At high temperature, the proportion of ______ wavelength radiation increases.
- A
AM radio
- B
Long radio
- C
Shorter
- D
Both A and C
When the temperature of an object is increased it emits light of shorter wavelength according to E=hc/lambda, since the energy of the object increases the wavelength becomes short.
a) AM radio: AM stands for "Amplitude Modulation," and AM radio stations typically transmit signals in the medium-frequency (MF) range. These signals are characterized by changes in the amplitude (height) of the radio waves. The proportion of AM radio wavelength radiation does not necessarily increase at high temperatures.
b) Long radio: This option seems to refer to longer wavelengths in the radio frequency spectrum. Long radio waves are typically associated with low-frequency (LF) and very low-frequency (VLF) signals. The proportion of long radio wavelength radiation might increase at high temperatures due to various atmospheric effects.
c) Shorter: As the temperature increases, the atoms and molecules in a material vibrate more vigorously, which can lead to the emission of higher-energy photons. Higher-energy photons are associated with shorter wavelengths according to the electromagnetic spectrum. So, the proportion of shorter wavelength radiation generally increases at high temperatures.
d) Both A and C: This option suggests that both AM radio wavelength radiation (Option A) and shorter wavelength radiation (Option C) increase at high temperatures. While Option A might not be accurate, Option C is correct.
Tagged under Physics · Dawn of Modern Physics · 2008