^Sun appears red at Sun rise & sun set This is because at Sun rise & sun set light passes through greater thickness of atmosphere, as a result more scattering takes place & blue colour & low wavelengths are scattered away by the scattering caused by the atmosphere & the colour which reaches us is […]
^Dangers signals are made red Danger signals, traffic lights etc. are made red. Red light being longest wavelength is scattered least & hence can go to large distance without any appreciable loss due to scattering.
^Sky appears blue As blue colour has least wavelength, hence when white light encounters obstacles of size a << λ, blue colour is scattered max. Due to this reason sky appears blue.
^Scattering of light When unpolarized light falls on a gas or air molecules light falling on air molecules. The electric field of light polarises the air molecule makes it an electric dipole, which starts oscillating under the influence of oscillatory electric field of light & these dipoles radiate electromagnetic waves in all directions. This process […]
^Problem solving tips If a particle is moving on a circular path with angular speed w about the center, then its angular speed about a point on the opposite side of the diameter passing through it is w/2. If uniform speed remains constant then the motion is called uniform circular motion. Magnitude of v, at […]
^Kinematics of circular motion Suppose a particle is rotating anticlockwise in a circular path in xy plane. Its angular velocity vector at any point on circular path w.r.t. center is
^Inclined plane projectiles
^Horizontal range Horizontal distance in the plane of projection is called horizontal range, it is Horizontal range is same for complementary angles. The product of time of flights of two projectiles fired from same point with same speeds at complementary angles is Vertical range Diagram above shows a situation a projectile is fired at a […]
^Time of flight From point F.5. b (ii) we know vy = zero at projectile reaches its maximum height from point of projection. In the absence of air friction, wind & upthrust (actually all forces other than gravity) projectile takes same time to return back from maximum height to level plane of projection i.e. to […]
^Describing velocity 4. Velocity of a projectile is defined as 5. Using v – t relation for the motion O to P along x & y axis we can write (a) v x – t relation: As there is no term containing time, thus we can say that the horizontal component of velocity is time […]
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