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CBSE Class 9 Answered

How are double rainbows formed? How is a moonbow formed? Why does the moonbow occur very rarely?
Asked by aahnik.mohanty | 01 Dec, 2017, 07:28: PM
answered-by-expert Expert Answer
A double rainbow is formed when there the ray of light suffers secondary total internal reflection inside the droplet of rain or moist air.
Moonbow occurs when the Moon's light is reflected and refracted from the water droplets in the air.
There has to be a perfect situation in the weather for reflection and refraction to occur at the same time.
Also, moon has to be full or partially full and lower in the sky with respect to horizon than usual.
Answered by Gajendra | 01 Dec, 2017, 08:02: PM

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CBSE 9 - Physics
why is it necessary for acceleration to be based on velocity but not on speed? why we dont consider the increasing speed of rectilinear motion as acceleration? why is it so in the first place?
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CBSE 9 - Physics
what is retardation
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CBSE 9 - Physics
True or false: The motion of a freely falling body is an example of uniformly accelerated motion.
Asked by juhi.panchal | 05 May, 2022, 11:26: AM
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CBSE 9 - Physics
A car increases it’s speed from 36km/h to 54km/h in 2s Find Distance travelled by the car
Asked by grangerhermione951 | 02 Dec, 2021, 08:32: AM
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CBSE 9 - Physics
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Asked by psdarshan25082007 | 08 Sep, 2021, 08:14: PM
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CBSE 9 - Physics
A boy travelling in a car at a speed of 108Km/h came to rest after applying breaks. Before coming to rest it covers 30m. It's acceleration is
Asked by 2103030034 | 28 Aug, 2021, 03:06: PM
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CBSE 9 - Physics
A force acts for 10 secs on a stationary body of mass 100kg after which the force ceases to act. The body moves through a distance of 100m in the next 5 secs. Calculate:- i) the velocity acquiured by the body ii) the acceleration producced by the force iii) the magnitude of the force
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CBSE 9 - Physics
use the below v-t graph calculate, (a)the acceleration of the body as it moves from 0 to A (b)the distance covered by the body from o to a c THE acceleration of the body from B TO C
question image
Asked by vikaashrajan11 | 28 Jul, 2021, 09:55: PM
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CBSE 9 - Physics
A train starting from rest attains a velocity of 72 km/hr in 5 minutes. Assuming that the acceleration is uniform find the acceleration. *
Asked by jainpranav33047 | 20 Jul, 2021, 09:28: AM
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CBSE 9 - Physics
Give one example for each of the type of motion when i) Acceleration is in the direction of motion ii) Acceleration is against the direction of motion iii) Acceleration is uniform
Asked by ansh231206bhatia | 29 May, 2021, 03:42: PM
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