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The term plank time tp refers the big bang at which the laws of physics began to be applied to understand physical phenomenon check whether the proposed formula for plank time given below is correct or not Tp=1/√2pie√ge/√c^5 Here g, e, c and v correspond to the universal gravitation constant energy the speed of light and frequency and resp

Posted by Kamaljeet Kaur 7 years, 1 month ago

CBSE > Class 11 > Physics

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Describe a method for measuring the molecular size of oleic acid

Posted by Tulsi Sha 7 years, 1 month ago

CBSE > Class 11 > Physics

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1°54'=?

Posted by Vaishanavi Sharma 7 years, 1 month ago

CBSE > Class 11 > Physics

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The spring made of a steel and not of copper . Give reason

Posted by Himanshu Gautam 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

A good spring will be that in which a large restoring force is developed on being deformed. This in turn depends on the elasticity of the material of the spring. Since Young’s modulus for steel is more than that of copper, therefore the springs made of steel and not of copper.

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Find an expeession for the weight of a body at the centre of the body

Posted by Himanshu Gautam 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Avantika Tayal 7 years, 1 month ago

W=mg in the centre g is 0 so,W=m×0=0

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An artificial satellite orbiting the earth in very thin atmosphere loses its energy gradualydue to dissipation against atmosphere , resistance however small . why then does it speed increases progressively as it comes closer and closer to the earth

Posted by Ashish Sharma 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Gaurav Seth 7 years, 1 month ago

For a satellite orbiting the earth, the necessary centripetal force is applied by gravitational pull.

That is,

Retarding torque is applied by the air friction. Hence, there is a decrease in the angular momentum. Therefore, the speed increases.

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Dued how many of you are having physics exam tomorrow.??

Posted by Kriti Sharma 7 years, 1 month ago

CBSE > Class 11 > Physics

4 answers

Himani Pandey 7 years, 1 month ago

Mine is tomorrow....only few hours are left?

1Thank You

Garhwalli???? Nona 7 years, 1 month ago

Mine is on 12 march

1Thank You

Priya Dharshini ? 7 years, 1 month ago

Mine is on 21st

1Thank You

Ashish Sharma 7 years, 1 month ago

my exam on 22 feb

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Which ques are imp for 5 marks

Posted by Gursharn Kaur 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Pragati Gola 7 years, 1 month ago

Doppler effect ,projectile, refrigerator,heat engine

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What is dopplers effect

Posted by Kavisha Anand 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

Doppler Effect is the phenomenon of motion-related frequency change.
Consider if a truck is coming from very far off location as it approaches near our house, the sound increases and when it passes our house the sound will be maximum. And when it goes away from our house sound decreases.
This effect is known as Doppler Effect.
A person who is observing is known as Observer and object from where the sound wave is getting generated it is known as Source.
When the observer and source come nearer to each other as a result waves get compressed. Therefore wavelength decreases and frequency increases.

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Snell law

Posted by Aman Katal 7 years, 1 month ago

CBSE > Class 11 > Physics

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Tell me imp que of physicd

Posted by Akash Choudhary Dav Gandhinagar 7 years, 1 month ago

CBSE > Class 11 > Physics

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A soap bubble of radius R and filled thickness is t (t<<r) coalesce to form a liquid drop .find the rise in temp.of the drop ? Surface tension of soap solution is T , density is p and specific heat of soap solution is s

Posted by Garima Maurya 7 years, 1 month ago

CBSE > Class 11 > Physics

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When temperature equal in kelvin and celcius

Posted by Abhishek Tomar 7 years, 1 month ago

CBSE > Class 11 > Physics

3 answers

Î$Hîkâ Gûptâ???? 7 years, 1 month ago

kriti sharma from which stream you are maths or bio

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Kriti Sharma 7 years, 1 month ago

0degree

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Akash Choudhary Dav Gandhinagar 7 years, 1 month ago

-40

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How to solve numericals on resolution of vectors

Posted by Chirag Kesar 7 years, 1 month ago

CBSE > Class 11 > Physics

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Tips to gets marks in pointwise?

Posted by Nonglemba Singha 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Kriti Sharma 7 years, 1 month ago

Dued it is the best way of giving marks by teachers .you need to write the question stepwise step what follows after what ok even if you forget the last step you will be awarded marks of all the steps you did .it increases the possiblitiy of getting good marks .

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Hey share the important questions of physics that your teachers had shared with you.

Posted by Kriti Sharma 7 years, 1 month ago

CBSE > Class 11 > Physics

5 answers

Sanidhya Jadaun? 7 years, 1 month ago

Tomorrow is my last exam................computer science.....???

1Thank You

Kriti Sharma 7 years, 1 month ago

I know bahut time lagta hai yaar i am greatly thankfull to you.

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Kriti Sharma 7 years, 1 month ago

Thanks sanidhya so much. What is your next exam now

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Sanidhya Jadaun? 7 years, 1 month ago

4)Describe Carnot's reversible heat engine and obtain an expression for its efficiency............5) state and prove bournolli's theorem and mentio its application .............6) if the earth stops rotating about it's axis ,what will be the effect on the value of g? will this effect be same at all places?...........

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Sanidhya Jadaun? 7 years, 1 month ago

Hey Kriti these are some theoretical questions and numericals which came in my exam............1) the velocity of an aeroplane is doubled (i) what will happen to the momentum? Will the momentum remain conserved?(ii)what will happen to the kinetic energy?will the energy remain conserved?................2) Establish the displacement equation of a plane progressive wave...............3) Two sprongs of force constant k1 and k2 are joined ene to end and suspended from a support.A body of mass m is attached to the lower end .Find out the period of oscillation of the body......................... yaar bahut der lagti he type karne main isliye or nhi daal paunga questions wi isse bhi bade he .......hope this may help u.............?

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Please tell me the important question of physics ....?????? Tomorrow is my physics paper.

Posted by Akash Choudhary Dav Gandhinagar 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Rishav Sharma 7 years, 1 month ago

In the collisin read tge diff bw elastic inelastic collison

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Derive an expression for the instantaneous velocity of the particle executing SHM. Find the position at which the particle velocity is (i) maximum and (ii) minimum.

Posted by Hardeep Singh 7 years, 1 month ago

CBSE > Class 11 > Physics

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Q.(2). Derive an expression for the instantaneous velocity of the particle executing SHM. Find the position at which the particle velocity is (i) maximum and (ii) minimum.

Posted by Hardeep Singh 7 years, 1 month ago

CBSE > Class 11 > Physics

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How much external force is required to move a body with uniform velocity along a straight line

Posted by Shruti Saini 7 years, 1 month ago

CBSE > Class 11 > Physics

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What is wark energy theorem

Posted by Jitesh Kumar 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Pragati Gola 7 years, 1 month ago

The workdone by force is equal to change in its kinetic energy. w=1/2mv^2-1/2mu^2

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How are you all preparing for your physics exam

Posted by Kriti Sharma 7 years, 1 month ago

CBSE > Class 11 > Physics

3 answers

Sanidhya Jadaun? 7 years, 1 month ago

Just note down the important formulaes of derivations which will remind u the whole concept and revise the notes as much as possible.........????

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Priya Dharshini ? 7 years, 1 month ago

I am preparing 97 derivation,solved and unsolved question of ncert, few worksheets from my school.

1Thank You

Gaurav Pradhan 5 years, 11 months ago

I m making summary and formula sheets and solving most of the ncert exercise questions.

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Would you expect a typical trajectory of a ping-pong ball to be a parabola,why?

Posted by Shruti Nain 7 years, 1 month ago

CBSE > Class 11 > Physics

2 answers

Paridhi Tiwari 7 years, 1 month ago

Ooh i think my answer is incorrect ??

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Paridhi Tiwari 7 years, 1 month ago

A projectile body which falls under gravity can be consider as projectile

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Bernollie's theorm

Posted by Chandan Rthor 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Paridhi Tiwari 7 years, 1 month ago

This theorem states that for a stream line flow of an ideal liquid, the total energy ( the sum of press. energy, P.E and K.E) per unit mass remains constant at every cross - section through out the liquid flow.

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What is torcelli theorem

Posted by Bharat Madan 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Paridhi Tiwari 7 years, 1 month ago

The velocity with which the liquid flows out from a narrow hole , is equal to that which a freely falling body would acquire in the falling through a vertical distance equal to the depth of orifice below the free surface of liquid

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What is thurmodymaic

Posted by Rahul Mandavi 7 years, 1 month ago

CBSE > Class 11 > Physics

3 answers

Rajdeep Tripathi 7 years, 1 month ago

Koi mahan vyakti lag rhe ho ap

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Bharat Madan 7 years, 1 month ago

Branch of science which deals with study of flow of heat

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Nikita Kumar 5 years, 11 months ago

Pahle thermodynamic ka spelling sikh lo Then ask

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bernoalli's thoram

Posted by Saurabh Soni 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Sanidhya Jadaun? 7 years, 1 month ago

Let us consider two different regions in the above diagram. Let us name the first region as BC and the second region as DE. Now consider the fluid was previously present in between B and D. However, this fluid will move in a minute (infinitesimal) interval of time (∆t). If the speed of fluid at point B is v1 and at point D is v2. Therefore, if the fluid initially at B moves to C then the distance is v1∆t. However, v1∆t is very small and we can consider it constant across the cross-section in the region BC. Similarly, during the same interval of time ∆t the fluid which was previously present in the point D is now at E. Thus, the distance covered is v2∆t. Pressures, P1 and P2, will act in the two regions, A1 and A2, thereby binding the two parts. The entire diagram will look something like the figure given below. Bernoulli's equation Finding the Work Done First, we will calculate the work done (W1) on the fluid in the region BC. Work done is W1 = P1A1 (v1∆t) = P1∆V Moreover, if we consider the equation of continuity, the same volume of fluid will pass through BC and DE. Therefore, work done by the fluid on the right-hand side of the pipe or DE region is W2 = P2A2 (v2∆t) = P2∆V Thus, we can consider the work done on the fluid as – P2∆V. Therefore, the total work done on the fluid is W1 – W2 = (P1 − P2) ∆V The total work done helps to convert the gravitational potential energy and kinetic energy of the fluid. Now, consider the fluid density as ρ and the mass passing through the pipe as ∆m in the ∆t interval of time. Hence, ∆m = ρA1 v1∆t = ρ∆V Change in Gravitational Potential and Kinetic EnergyNow, we have to calculate the change in gravitational potential energy ∆U.Bernoulli's equation.Similarly, the change in ∆K or kinetic energy can be written asBernoulli's equation.Calculation of Bernoulli’s EquationApplying work-energy theorem in the volume of the fluid andDividing each term by ∆V andRearranging the equation will yieldBernoulli's equation.The above equation is the Bernoulli’s equation. However, the 1 and 2 of both the sides of the equation denotes two different points along the pipe. Thus, the general equation can be written asBernoulli's equation.Thus, we can state that Bernoulli’s equation state that the Pressure (P), potential energy (ρgh) per unit volume and the kinetic energy (ρv2/2) per unit volume will remain constant.

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Give reason why a p type semiconductor is electrically neutral although no. of holes is greater than no. of electrons?

Posted by Arti Choudhary 7 years, 1 month ago

CBSE > Class 11 > Physics