Question

Radio waves of certain double wavelength can pass through night waves do not. The reason is that radio waves

• A. travel with speed larger than \(c\)
• B. have much larger wavelength than light
• C. carry news
• D. are not electromagnetic waves

Hint:

Long wavelength radio waves reflect better from ionosphere and can travel long distances (especially at night).

Answer 1

The Correct Option is B

Step 1: Understand why radio waves can pass/reflect.
Radio communication depends on reflection of waves from ionosphere.
Longer wavelengths (lower frequency) undergo reflection more easily by ionosphere layers.
Step 2: Compare radio waves and light waves.
Radio waves have much larger wavelength compared to visible light.
Because of this, they interact differently with atmospheric and ionospheric conditions.
Step 3: Conclude reason.
Thus radio waves can pass/propagate while shorter waves cannot.
Final Answer: \[ \boxed{\text{have much larger wavelength than light}} \]