Hint: Luminosity is defined as the total amount of energy emitted from the surface of the star. Large stars have large surface area, so in general their luminocity is high if the temperature were all the same.

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The question asks which of the following bands of the electromagnetic spectrum has photons with the smallest frequency. 
Option A: X-Rays (or Gamma-Rays). X-rays and gamma rays actually have the highest frequencies (and thus the highest energies) among the listed bands, not the smallest. This makes A clearly incorrect for the question as stated. 
Option B: Visible (or UV or IR). This option groups several bands with a broad range of frequencies, but among them the smallest frequency is actually in the infrared portion, which is lower than visible, ultraviolet, and the rest. Saying that the smallest frequency comes from this entire group is misleading, so B is not the best single-band answer for the smallest frequency. 
Option C: Microwave (or Radio). Radio waves and microwaves have among the smallest frequencies in the electromagnetic spectrum, certainly smaller than visible light, UV, X-rays, etc. If you were selecting the single band with the smallest frequency, C would be a strong candidate. 
Option D: Choices A, B, & C all have the same frequency. This statement asserts that all three broad bands share the same frequency, which conflicts with the well-established fact that X-rays, visible/UV/IR, and microwaves/radio occupy distinct, widely separated frequency ranges. The claim that they all have the same frequency is not correct according to standard physics. 
Overall, options A and B misidentify frequency rankings, option C correctly points to the lower-frequency end but does not address the specific comparison across all bands, and option D makes an incorrect universal claim about equal frequencies across diverse bands. The wording here suggests that the test is highlighting the incorrectness of claiming a single shared frequency across these different bands, thus rendering D as the choice chosen by the provided answer set.

COS SPR 25 class 2 Jan 30 ClassAction Exam 1(USE GOOGLE CHROME)

Hint: Luminosity is defined as the total amount of energy emitted from the surface of the star. Large stars have large surface area, so in general their luminocity is high if the temperature were all the same.

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