Question

practice 2: select all true statements.

1. which of the following statements about the electromagnetic spectrum are true?

a. the electromagnetic spectrum is composed of many different wavelengths
b. the light we see is a portion of the electromagnetic spectrum
c. the sun emits electromagnetic radiation in the electromagnetic spectrum
d. all objects emit radiation found in the electromagnetic spectrum
e. the electromagnetic spectrum does not include visible light wavelengths

Explanation:

• Statement A: The electromagnetic spectrum indeed has various wavelengths ranging from radio waves (long wavelength) to gamma rays (short wavelength).
• Statement B: Visible light (which we can see) is a part of the electromagnetic spectrum (ranging approximately from 400 - 700 nm in wavelength).
• Statement C: The Sun emits a broad range of electromagnetic radiation, including visible light, ultraviolet, infrared etc.
• Statement D: According to the Stefan - Boltzmann law and the concept of black - body radiation, all objects with a temperature above absolute zero emit electromagnetic radiation.
• Statement E: Visible light is a well - known part of the electromagnetic spectrum.

Answer:

A. The electromagnetic spectrum is composed of many different wavelengths, B. The light we see is a portion of the electromagnetic spectrum, C. The Sun emits electromagnetic radiation in the electromagnetic spectrum, D. All objects emit radiation found in the electromagnetic spectrum.