Q1: A black body does not __________ radiation.

ANS:D - both(b) & (c)

A black body does not reflect radiation. Explanation:

• A black body is an idealized physical body that absorbs all electromagnetic radiation incident upon it, regardless of wavelength or angle of incidence, and emits radiation at all wavelengths according to its temperature.
• According to Kirchhoff's law of thermal radiation, a black body is a perfect absorber, meaning it absorbs all radiation incident upon it.
• Additionally, a black body is also a perfect emitter, meaning it emits radiation at all wavelengths according to its temperature, and its emission spectrum follows the Planck radiation law.
• However, a black body does not reflect radiation. Unlike real-world objects, which may reflect some portion of incident radiation depending on their surface properties, a black body absorbs all radiation and does not reflect any portion of it.
• Therefore, a black body does not refract or reflect radiation, making the correct option both (b) & (c).