PHYSICS MAM JKC

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LDR Take 6 different reading for resistance ( R ) against a distance (d) Draw the conclusion Light dependent resistor Aim: to study the effect of intensity of light dependant resistor ( L.D.R.) Apparatus : L.D.R. , filament lamp (16 V , 3W) meter scale, D.C. Power supply , Digital multimeter  (DMM) Result: The intensity of light is inversely proportional to the square of distance.

  Aim: To determine refractive index of Glass by total internal reflection. Apparatus: glass slab, plane white paper, laser pointer ,geometrical instrument box. Result Value of refractive index n = 1.33 MCQ 1. Total internal reflection happens when light travels from: A. Air to glass B. Glass to air C. Vacuum to air D. Water to glass Answer: B 2. Total internal reflection occurs only when angle of incidence is: A. Less than critical angle B. Equal to critical angle C. Greater than or equal to critical angle D. Zero Answer: C 3. The critical angle is the angle of incidence for which the angle of refraction is: A. 90° B. 0° C. 45° D. 180° Answer: A 4. The refractive index of glass can be found using: A. n = sin ⁡ c n = \sin c B. n = 1 sin ⁡ c n = \frac{1}{\sin c} ​ C. n = cos ⁡ c n = \cos c D. n = tan ⁡ c n = \tan c Answer: B 5. Which tool provides a narrow straight beam of light? A. Torch B. Candle C. Laser pointer D. Bulb Answer: C 6. A glass slab...

  Melde’s Experiment Aim :- Arrange the tunning fork for parallel position. Take two different reading by changing the tension and keeping the length of String constant. Write your conclusion. Apparatus : Electronic vibrator , a light in extensible string ,pan , Fractional weight box ,etc. Observation :- i. mass per unit length of string = m= 2.03 x10-3 g/cm ii. Vibrating length of string =l =100cm. iii. Mass of empty scale pan= mo= 3 g. Result 1) As tension in the string increases no. of loop on the string decreases

Second’s pendulum Aim : To determine the length of second’s pendulum App: metal sphere (bob) , inextensible string , retort stand, meter scale , stop watch, vernier calliper. Formula :  Observation: Radius of the bob= 0.9cm ,  Period of second’s pendulum Ts= 2 sec. Observations for period oscillation T= period Length of second’s pendulum =  Result : length of second’s pendulum= L s =103.24 cm

  7. Wave motion        Introduction  The wave motion has double periodicity. i.e. It is periodic in space & periodic in time.   Wave can be defined as an oscillatory disturbance traveling through a medium without change of form.    There are two types of wave (1) Transverse wave   A wave in which particles of a medium vibrate in a direction perpendicular to the direction of propagation of the wave is called as Transverse wave.  (2) Longitudinal wave A wave in which particles of medium vibrate in a direction parallel to the direction of propagation of the wave is called as longitudinal waves. For the propagation of wave through the medium, it must possess the following condition.  (1)The medium should be elastic i.e. It can regain its original shape & size as soon as the wave passes through it. (2)The medium should possess the inertia, so that it can store the energy & transfer in the form of waves. (3)...

    Wave theory of Light                  Introduction                     Light is the form of energy which makes object visible to our eyes. Light has dual nature particle as well wave nature . There were two theories proposed to discuss nature of light.     (1) Newton’s corpuscular theory of light, based on the particle nature of light    (i) Every source of light emits large number of tiny particles known as 'corpuscles' in a medium surrounding the source.  (ii) These corpuscles are perfectly elastic, rigid and weightless.  (iii) The corpuscles travel in a straight line with very high speeds, which are different in different media.  (iv)  One gets a sensation of light when the corpuscles fall on the retina.  (v) Different colours of light were due...