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Lesson Posted on 04 Mar CBSE/Class 11/Science/Physics

critical angle and refractive index of a material

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

(i) What is the relation between critical angle and refractive index of a material ? (ii) Does critical angle depend on the colour of light ? Explain. ANSWER (i) Refractive index = 1/sin C where C is the critical angle. (ii) Since, refractive index depends upon the wavelength of light, the critical... read more

(i) What is the relation between critical angle and refractive index of a material ?
(ii) Does critical angle depend on the colour of light ? Explain.

ANSWER

(i) Refractive index = 1/sin C
where C is the critical angle.
(ii) Since, refractive index depends upon the wavelength of light, the critical angle for a given pair of media is different for different wavelengths (colours) of light

 

Distinguish between any two types of propagation of electromagnetic waves with respect to
(i) frequency range over which they are applicable.
(ii) communication systems in which they are used.

 

ANSWER

 

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Lesson Posted on 04 Mar CBSE/Class 11/Science/Physics

PHYSICS

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

QUESTION Describe schematically the equipotential surfaces corresponding to (i) a constant electric field in the Z-direction, (ii) a field that uniformly increases in magnitude but remains in a constant (say Z) direction and (iii) a single positive charge at the origin. ANSWER (i) As the constant... read more

QUESTION

Describe schematically the equipotential surfaces corresponding to
(i) a constant electric field in the Z-direction,
(ii) a field that uniformly increases in magnitude but remains in a constant (say Z) direction and
(iii) a single positive charge at the origin.

 

ANSWER

(i) As the constant electric field in the Z-direction, the equipotential surfaces are normal to the field, i.e. in XY-plane. The equipotential surfaces are equidistant from each other.

(ii) As, the electric field increases in the direction of Z-axis, the equipotential surface is normal to Z-axis, i.e. in XY-plane and they become closer and closer as the field increases.

(iii) As a single positive charge is placed at origin, the equipotential surfaces are concentric spheres with origin at centre.

 

QUESTION

(a) Explain any two factors which justify the need of modulating a low frequency signal.
(b) Write two advantages of frequency modulation over amplitude modulation

 

ANSWER

a) (i) Effective power radiated by an antenna.
(ii) To avoid mixing up of signals from different transmitters.
(b) (i) FM signals can be demodulated even if the signal strength is weak.
(ii) FM reception is quite immune to noise as compared to AM reception.

 

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Lesson Posted on 04 Mar CBSE/Class 11/Science/Physics

Calculate the radii of (i) the third orbit of He+ ion and (ii) the second orbit of Li2+ ion.

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

QUESTION The radius of first Bohr orbit of hydrogen atom is 0.529 A. Calculate the radii of (i) the third orbit of He+ ion and (ii) the second orbit of Li2+ ion. ANSWER read more

QUESTION

The radius of first Bohr orbit of hydrogen atom is 0.529 A. Calculate the radii of (i) the third orbit of He+ ion and (ii) the second orbit of Li2+ ion.

 

ANSWER

 

 

 

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Lesson Posted on 04 Mar CBSE/Class 11/Science/Physics

Water can boil and freeze at the same time

Aniruddha Bhattacharjee

I am an experienced, qualified teacher and tutor with over 5 years of experience in teaching Physics...

Seriously,It's called the tripple point.The temperature and pressure at which a substance can exist in equilibrium in the liquid, solid, and gaseous states.The triple point of pure water is at 0.01°C (273.16K, 32.01°F) and 4.58 mm (611.2Pa) of mercury.
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Answered on 20 Mar CBSE/Class 11/Science/Physics Tuition/Class XI-XII Tuition (PUC)

Nitesh Rai

Tutor

centripetal force required to turn in a curve.
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Answered on 02 Feb CBSE/Class 11/Science/Physics Tuition/Class XI-XII Tuition (PUC)

Sujoy D.

Tutor

Mass of the gun, M = 100 kg Mass of the shell, m = 0.020 kg Muzzle speed of the shell, v = 80 m/s Recoil speed of the gun = V Both the gun and the shell are at rest initially. Initial momentum of the system = 0 Final momentum of the system = mv â?? MV Here, the negative sign appears because the... read more

Mass of the gun, M = 100 kg Mass of the shell, m = 0.020 kg Muzzle speed of the shell, v = 80 m/s Recoil speed of the gun = V Both the gun and the shell are at rest initially. Initial momentum of the system = 0 Final momentum of the system = mv â?? MV Here, the negative sign appears because the directions of the shell and the gun are opposite to each other. According to the law of conservation of momentum: Final momentum = Initial momentum mv â?? MV = 0 â?´ V = mv / M = 0.020 Ã? 80 / (100 Ã? 1000) = 0.016 m/s

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Answered on 02 Feb CBSE/Class 11/Science/Physics Tuition/Class XI-XII Tuition (PUC)

Sujoy D.

Tutor

Consequences of Newton's second law of Motion : 1.This law gives the measure of force and the unit force is defined from this law. 2.This is the real law of motion because both first and third laws can be derived from this law
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Answered on 21 Mar CBSE/Class 11/Science/Physics Tuition/Class XI-XII Tuition (PUC)

Vishesh Nigam

Physics Teacher

The angle is 45 degrees Watch this video made by me to understand the concept better https://www.youtube.com/watch?v=N4l0hJ9x4Tg&list=PLQgL7RKnNg_yrgYAhTNAEoshDNDHDBAWr&index=4&t=7s read more

The angle is 45 degrees

Watch this video made by me to understand the concept better

https://www.youtube.com/watch?v=N4l0hJ9x4Tg&list=PLQgL7RKnNg_yrgYAhTNAEoshDNDHDBAWr&index=4&t=7s

 

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Answered on 03 Jan CBSE/Class 11/Science/Physics Tuition/Class XI-XII Tuition (PUC)

Sonika Tyagi

weight of the body
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