Physics - Study Mode

[#1306] Sun appears red in colour at sunrise and sunset due to
Correct Answer

(D) That all other colours scatter away except red

Explanation

Solution: During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.

[#1307] Total number of colours exists in sunlight
Correct Answer

(B) 7

Explanation

Solution: White light is called as white because it consists of seven colors. The sunlight splits into seven colors namely violet, indigo, blue, green, orange, and red. We usually call it as VIBGYOR.

[#1308] When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
Correct Answer

(B) The red ray

Explanation

Solution: When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is the red ray.

[#1309] Rainbows are produced when sunlight :
Correct Answer

(B) Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.

Explanation

Solution: Rainbows are produced when sunlight incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.

[#1310] Red light is used for signals because it has
Correct Answer

(A) Long wavelength

Explanation

Solution: Red light is used as danger signal because it is having high wavelength, less scattering ,hence can travel larger distances.