Given : ∆ABC in which D and E are points on sides AB and AC respectively, such that BD = CE.
To prove : DE || BC.
Proof: In ∆ABC, we have
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The general equation of simple harmonic progressive wave is, ...(1) Differentiating (1) with respect to time,
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Find CBSE, ICSE State Boards Textbook Solutions of Class 8 to 12 of all subjects. Read NCERT Textbooks Questions and Answers & Find Previous year solved papers.
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NiCl42-, there is Ni2+ ion, However, in presence of weak field Cl- ligands, NO pairing of d-electrons occurs. Therefore, Ni2+ und
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(i) Acetaldehyde (CH3CHO) reacts with hydrogen cyanide HCN to give 2-Hydroxypropapanenitrile as product.
(ii) Acetaldehyde (CH3CHO) reacts with Hydroxylamine (
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(ii) Acetaldehyde (CH3CHO) reacts with Hydroxylamine (
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When he reaches near the roundabout, he wishes to get a ride on it and he asks his parents for it. When he gets no reply, he turns around to look for his pare
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Given, Electric field, E = 104 NC-1Torque , τ = 9×10-26 N mθ=30° When electric dipole
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If sin θ = 0 or r = 0
then, θ= 0°, 180°That is, Torque = 0.
That is, when line of action of forces passes through the axis of rotation, torque is zero.
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then, θ= 0°, 180°That is, Torque = 0.
That is, when line of action of forces passes through the axis of rotation, torque is zero.
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When Bholi was of ten months, she fell off the cot on her head. The injury adversely affected Bholi’s mental and speaking capabilities. She could not spea
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Snell’s law of refraction using Huygen’s Principle :
Consider a plane wavefront AB incident on a surface PQ separating two media 1 and 2.
The medium 1 is a rarer medium of refractive index n1 in which light travels with a velocity C1 The medium 2 is a denser medium of refractive index n2 in which light travels with a velocity C2.
The angle between the incident ray FA and the normal NA at the point of incidence A is equal to i.
The angle is also equal to the angle between the incident plane wavefront BA and the surface of separation PQ.
So ∠BAD is the angle of incidence of the in
Consider a plane wavefront AB incident on a surface PQ separating two media 1 and 2.
The medium 1 is a rarer medium of refractive index n1 in which light travels with a velocity C1 The medium 2 is a denser medium of refractive index n2 in which light travels with a velocity C2.
The angle between the incident ray FA and the normal NA at the point of incidence A is equal to i.
The angle is also equal to the angle between the incident plane wavefront BA and the surface of separation PQ.
So ∠BAD is the angle of incidence of the in