If all the components of a vector is equal to 1, then that vector is not a unit vector but .
Answer: False
Explanation:
Unit Vector
A vector which defines the direction of a physical quantity is known as a Unit Vector. For a vector, the unit vector is the vector/ mod of the value. Since the mod of a unit vector is always 1, the value is simply represented as its vector form.
If we take all the components of a vector quantity as 1, then its mod will be,
i.e. which is not a unit vector.
Hence, the given statement is false.
All components of a vector being equal to 1 does not necessarily define a unit vector. A unit vector is defined by having a magnitude, or length, of 1. Unless it's a 1-D vector with its single component as 1, a vector with all components as 1 won't be a unit vector.
In mathematics, particularly vector algebra, a unit vector is a vector of length 1. The condition you've mentioned – all components of a vector being equal to 1 – does not generally define a unit vector. When the components of a vector are all 1s (in a 2D or 3D space, for instance), the resultant vector is not a unit vector. This is because the magnitude or length of a vector is calculated by the square root of the sum of the squares of its components.
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A)solids
B)liquids
C)plasma
Answer:
Option 3) Constructive And destructive interference of light waves
Explanation:
When the light is incident on a soap bubble of certain thickness it constructively interferes for wavefronts which are in phase to produce white light and when the wavefronts are out of phase, they undergo destructive interference to produce a series of colors. Thus, interference is the reason.
A ray at which angle would produce the most glare is at 70 degrees. The answer is letter D. the greater the incident of light is, the greater is its index of refraction and thus having greater angle to produce a light ray.
The ray more the incidence ray, the more will be the reflected ray. As angle of incidence is to angle of reflection.
Glare can be defined as the difficulty in seeing the object due to more brightness. The bright light such as the direct sunlight or the reflected sunlight or the headlight at the nighttime.The more the intensity the more will be glare.
Hence, the ray that will produce most glare is 70 degree.