Red light is used for signals because it has
A). Long wavelength
B). High intensity
C). High frequency
D). Low refraction in the medium
Long wavelength
Red light is used as danger signal because it is having high wavelength, less scattering ,hence can travel larger distances.
1. The component used for tuning a radio is basically a variable
2. A carbon microphone is best used in
3. What is the value of 1 kW = ?
5. The ''Greenhouse effect' is mainly due to increase in atmospheric
7. During the motion of a projectile fired from the earth surface, ________
8. Sources of geothermal power are
9. What is the SI unit of temperature?
10. When the main switch of the house is put off it disconnects the