Question

About black body radiation, which one of the following is a WRONG statement?

• A. For all wavelengths, power radiated is same
• B. For shorter wavelengths, radiated power is more
• C. for longer wavelengths, radiated power is less
• D. All wavelengths are emitted by the black body

Hint:

The black body curve has a peak, so power depends on wavelength.

Answer 1

The Correct Option is A

Step 1: Think of the graph:
The Planck curve is a hump, not a flat line.

Step 2: Test the claim:
Equal power at all wavelengths would give a horizontal line, which would also mean infinite total energy. This is not what is observed.

Step 3: Pick:
Statement (A) is the false one.

Final Answer:
The spectrum is a hump, not flat. \[ \boxed{A} \]