CBSE > Class 11 > Physics | CBSE Board | Homework Help

“The phenomenon of ejection of electrons from the surface of a metal when light of suitable frequency strikes on it, is called photoelectric effect.
The emitted electrons are called photoelectrons.”

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The resultant of P vector and Q vector is R vector. If Q vector is doubled, R vector is doubled, when Q vector is reversed and again R vector is doubled. Find P:Q:R????

Posted by Pallavi Prasad 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Aadya Singh 4 years, 2 months ago

P:Q:R = √2:√3:√2

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What do u mean by equilibrium???

Posted by Aadya Singh 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Aadya Singh 4 years, 2 months ago

Thank you?

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Pallavi Prasad 4 years, 2 months ago

If resultant force is zero is known as equilibrium.

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Instantaneous speed..??

Posted by Royal Thakur ? 4 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Suhani Soni 4 years, 2 months ago

Speed at a particular time or at an instant is called instantaneous speed.

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Aadya Singh 4 years, 2 months ago

Slope of distance- time graph...

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Aadya Singh 4 years, 2 months ago

Gud Mrng!!!!!

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A person of height " h " approaches lamp post of height " H" , with velocity " v" . Find out the velocity of shadow of the pery over the ground

Posted by Abhinab Sahu 4 years, 2 months ago

CBSE > Class 11 > Physics

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X.sinx integration

Posted by Shubham Pandey 4 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Akash Kushwaha 4 years, 2 months ago

Cosx

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Suhani Soni 4 years, 2 months ago

Cos x

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Aryan Soni 4 years, 2 months ago

Cos x

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In the HCl molecule, the separating between the nuclei of the two atoms is about 1.27 A (1A = 10 -10 m). Find the approximate location of the CM of the molecule, given that the chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in all its nucleus

Posted by Sannidhi . 4 years, 2 months ago

CBSE > Class 11 > Physics

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NCERT book pg 214 index all formula solution

Posted by Himanshu Kumar 4 years, 2 months ago

CBSE > Class 11 > Physics

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The resultant of vector P n Q is vector R. If vector Q is doubled, vector R is doubled. When vector Q is reversed, vector R is again doubled. Find P:Q:R.

Posted by Aadya Singh 4 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Aadya Singh 4 years, 2 months ago

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Aadya Singh 4 years, 2 months ago

Thanks miss Sadul Sharma ?

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Sharma Sadul? 4 years, 2 months ago

Let take the angle between P and Q is θ. The force expression according to given conditions are given as, P2+Q2+2PQcosθ=R2 (1) When Q is doubled, P2+4Q2+4PQcosθ=4R2 (2) When Q is reversed, P2+Q2−2PQcosθ=4R2 (3) Subtracting equation (3) from equation (1), we get 4PQcosθ=−3R2 PQcosθ=4−3R2 (4) Substituting the value from equation (4) to equation (1), (2) and (3), we get P2+Q2=25R2 P2+4Q2=7R2 P2+Q2=25R2 Simplify the above equations, we get P2=R2 Q2=23R2 Thus, the ratio is P:Q:R=√2:√3:√2.

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I was flagged inappropriate in this app for my content.... sorry form my side to him/her . But can anyone please tell my mistake...... because I have not used this app since last 5 days.........nor I have asked any qsns. or answered any......

Posted by Vivek Kumar 4 years ago

CBSE > Class 11 > Physics

3 answers

Shreya S❤ 4 years, 2 months ago

ohh

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Vivek Kumar 4 years, 2 months ago

No need to install the app again. Just logout & login again. Works with same no. also...??

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Sharma Sadul? 4 years, 2 months ago

U can again Install this app..and put another number to get OTP ..then u can use this app..properly..

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Derive expression for velocity of a car moving on a banked road

Posted by Prachi Aprajita Rout 4 years, 2 months ago

CBSE > Class 11 > Physics

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Derive the formula for kinetic energy of a particle having mass m and velocity v using dimensional analysis

Posted by Devesh Pawar 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Anushka Verma 4 years, 2 months ago

KE = 1/2mv^2

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Can i gave notes of laws of motion chaptee

Posted by Tania Sharma 4 years, 2 months ago

CBSE > Class 11 > Physics

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Drive expression for the velocities of two bodies after elastic one dimensional collision. Hence show that two bodies of same mass interchange their velocities after elastic one dimensional collision.

Posted by Yashika Hooda 4 years, 2 months ago

CBSE > Class 11 > Physics

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Equation of motion using graphical method

Posted by Yashika Hooda 4 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

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What scope and exitment of physics?

Posted by Monika Malviya 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 4 years, 2 months ago

Physics has a very wide scope. There are three domains of interest which are macroscopic domain, mesoscopic and microscopic domain. The macroscopic scale is the length scale on which objects or processes are of a size that is measurable and observable by the naked eye. The microscopic scale is the scale of size or length used to describe objects smaller than those that are easily be seen by the naked eye and which require a lens or microscope to see them clearly.

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Define screw guage

Posted by Kritika Gupta 4 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Prerna Kumari 4 years, 2 months ago

least count of screw guage is 0.01 and least count of vernier calliper is 0.01

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Sarthak Modi 4 years, 2 months ago

If it's helpful to you then please click on thanks button...

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Sarthak Modi 4 years, 2 months ago

Screw is substance/object which helps to find the measurement of small length or radius of small particles.it is works similar to vernier calliper.it has high precision.

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Ex 2.1

Posted by Aka Singh 4 years, 2 months ago

CBSE > Class 11 > Physics