What is the difference between Boiling and Evaporation? Gas and Vapour?

 What is the difference between Boiling and Evaporation? Gas and Vapour?

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Qn1: What is difference between boiling and evaporation ?

Qn2: Why do we sprinkle water on the roof or open ground in summer?

Qn3: What is the difference between gas and vapour?

 

Why Soap Bubbles Liquid drops take spherical shape ? Surface Tension Experiments Soap film taking minimum area

11P09D Surface Tension / Mechanical Properties of Fluids

Why Soap Bubbles, Liquid Drops take Spherical Shape ? Soap Film taking minimum Area.

Surface Tension is one topic that is slightly difficult for the students. Simple home experiments can help to grasp the idea.

Students Shreya and Jagan Surface Tension Experiments

NCERT Exercise 3.15 An aircraft executes a horizontal loop of radius 1.00 km with a steady speed of 900 km/h. Compare its centripetal acceleration with the acceleration due to gravity. What is G Force?

NCERT Exercise 3.15 An aircraft executes a horizontal loop of radius 1.00 km with a steady speed of 900 km/h. Compare its centripetal acceleration with the acceleration due to gravity.

v = 900 km/h = 250 m/s

Centripetal Acceleration,

ac = v²/r = 250² /1000 = 62.5 m/s² 

g = 9.8 m/s²  

ac = 6.4 g (6.4 times the gravitational acceleration)

What is G Force?

Student John Paul Anto's Microwave Oven Experiment - Experimental verification of speed of Electromagnetic waves

 12P08 Electromagnetic Waves

Student John Paul Anto's Microwave Oven Experiment - Experimental verification of speed of Electromagnetic waves

 

If you have access to a microwave oven, see if you can do this simple 10 minutes experiment in your microwave.

1. Remove the turn table inside the oven

2. Place an uncooked Chappathi (Tortila) or similar flour item spread out

3. Switch on the oven for a nominal time ( may be 1 minute or 2 minutes as required)

4. Open the oven and look for any black spots where the heat is concentrated

5. Measure the distance between the black spots using a measuring scale (few cm expected)

6. In the instrument label in the back side of oven look for any frequency of microwaves used.

7. We are looking for the Speed of Microwave c = Frequency x Lambda, calculations from the above values obtained.

8. Any videos or pictures of the experiment will be very helpful for educational purpose may be to upload in youtube.

 

Microwave is an Electromagnetic wave. All EM waves such as light, radio wave, microwave, infrared wave, uv rays, x rays, gamma rays travel at the speed of light c = 3 x 10⁸ m/s. This experiment is an attempt to experimentally verify the speed of microwaves.

 

 

Before Heating

After Heating, approx.6 cm gap between black spots

Student Swetha's Apparent Weight Experiments in Lift

 11P04 Newton's Laws of Motion

Student Swetha's Apparent Weight Experiments in Lift

(Class 11 student 2023-24)

Actual reading before getting on the lift: 50 kg shown. 
This is approx. 500 N due to gravity alone. Fg = mg = (50) (10) = 500 N.

Student Hashmitha's Double Slit Experiments YDSE

 12P10 Wave Optics: Student Hashmitha's Experiments 

(Class 12 student 2023-24)

 

Young's Double Slit Experiment YDSE: Small slits made in an aluminium foil and Laser light used here to get the bright and dark fringes.

12P12 Atoms

Chapterwise Study notes

NEET past year Questions, Solutions

NCERT competency based questions 2024, Solutions

NCERT competency based questions 2023, Solutions

NCERT Exemplar Questions, Solutions

What is Continuous Spectrum and Line Spectrum? 

What is Emission Spectrum and Absorption Spectrum? 

Click on the gas name to change to Hydrogen, Helium, Neon, Mecury and Sodium Lines

Finger Prints of Gas

Basic Mathematical Formula for Physics Numerical Solving

Which maths topics should a student study if he or she has not taken maths as one of the subject to tackle Physics problems?

I have given a small collection of basic maths topics that one has to study, who have not taken maths as one of the subjects. You may have to study with a maths teacher who is willing to teach you the basics. So that you can feel comfortable for your Physics numerical solving for your CBSE or State board exams and NEET / other entrance exams.

Mostly Algebra based problems can be tried and difficult trigonometry, log, exponential based problems can be skipped.

Remember this is just a guideline. If you do this short course around 30 hours, you may be able to overcome the fear of maths and feel confident for Physics problem solving.

11th Maths: 

Trigonometry: First two topics and exercises. 3.1, 3.2 (4 to 8 hours)

Introduction to Three Dimentional geometry: All topics and Exercises 11.1, 11.2 (4 to 8 hours)

Limits and Derivatives: Simple concepts on limits and derivatives. Solving some simple problems in Algebraic expressions is sufficient. Difficult trigonometric functions not necessary. (4 to 8 hours)

12th Maths:

Continuity and Differentiability: 5.2, 5.3, 5.7 simple problems in Second order differentiation. (4 to 8 hours)

Applications of Derivatives: Exercises 6.1, 6.2 (Maxima Minima finding important) (4 to 8 hours)

Integrals: Exercises 7.1, 7.8 (Area under the curve important) (4 to 8 hours)

Vector Algebra: Exercises 10.1, 10.2, 10.3, 10.4 (Entire chapter very important for Physics as we use dot product, cross product all the time) (4 to 8 hours)
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What? Basic Mathematical Formula for Physics Numerical Solving

Why? While doing Physics Numerical Solving students struggle with basic Maths principle that has to be applied in the numericals. Especially topics such as Vector Multiplication, Basic Differentiation, Basic Integration etc. students need help. 

A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5 Ohms / km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town. Estimate the line power loss, voltage drop, power to be supplied by the power plant, power loss percentage, step up transformer configuration