Question
Red light is used as danger signal because it is:
✓
Answer
- Has high wavelength
Red light is used as danger signal because it is having high wavelength, less scattering ,hence can travel larger distances.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
According to classical theory, the path of an electron in Rutherford atomic model is:
A paramagnetic material is kept in a magnetic field. The field is increased till the magnetization becomes constant. If the temperature is now decreased, the magnetization:
When one of the slits of Young’s experiment is covered with a transparent sheet of thickness $4.8\ mm,$ the central fringe shifts to a position originally occupied by the $30^{th}$ bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by $20^{th}$ bright fringe
→Magnetic induction is a(a) Scalar quantity(b) Vector quantity(c) Both (a) and (b)(d) None of the above
A ray of light passes through four transparent media with refractive indices $\mu_1, \mu_2, \mu_3$ and $\mu_4$ as shown in the figure. The surfaces of all media are parallel. If the emergent ray $CD$ is parallel to the incident ray $AB,$ we must have
→There are two metallic spheres of same radii, but one is solid, and the other is hollow, then:
Assuming that universe is expanding, if the spectrum of light coming from a star which is going away from earth is tested, then in the wavelength of light(a) There will be no change(b) The spectrum will move to infrared region(c) The spectrum will seems to shift to ultraviolet side(d) None of the above
Characteristic X-ray radiations are produced when :
The value of resistivity of super conductor is:
The electric field inside a conductor.