Question Library

When a man moves toward a plane mirror at a speed of 6m/s, the distance the man and his image increased at a speed of?

An alternating current with a frequency of 100HZ has a period of

What type of wave is emitted by a loud speaker?

An object is placed 15cm from a diverging lens of focal length 12cm. The image of the object formed by the lens in

When an air column is set into vibrations, the distance between two consecutive nodes of the resultant wave is

A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms-1]

The diagram given illustrates a wave form. Determine the speed of the wave

Red light travels faster than blue light when both of them pass through a glass prism because the

An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed

All electromagnetic waves in a vacuum have the same

An alternating current supply is connected to an electric lamp which lights with the same brightness as it does with direct current source emf 6v. The peak potential difference of the a.c supply is

You are provided with a triangular glass prism, four optical pins, and other necessary materials. Place the triangular glass prism on a drawing paper and draw its outline UMR. Remove the prism. Measure and record the value of the angle at U. Draw a normal to the line UM at N. Also, draw another line TN to the normal such that \(\phi\)-60. Fix two pins at \(P_1\) and \(P_2\). Replace the prism and fix two other pains at \(P_3\), and \(P_4\), such that the pins appear to be in a straight line with the images of the pins at \(P_1\) and \(P_2\), when viewed from the side UR. Remove the prism. Join points \(P_3\), and \(P_4\), producing the line to meet TN produced at Z. Draw the normal XY. Measure and record the angle of emergence e and that of deviation d. Repeat the experiment with \(\phi\) = 55^\circ, 50^\circ, 40^\circ and 35^\circ. In each case, measure and record the Corresponding values of e and d. Tabulate your readings. Plot a graph with d on the vertical axis and e on the horizontal axis starting both axes from the origin (0.0) Join your points with a smooth curve. From your graph, obtain the minimum deviation \(d_m\) and the corresponding angle of emergence \(e_m\) . Hence, calculate the refractive index n of the prism using the formula: n = \(\frac{sin (\frac{d_{m}+U}{2})}{sin{(\frac{u}{2})}}\) State two precautions taken to obtain accurate results. Attach your traces to your answer booklet. (b)i. State the conditions necessary for total internal reflection of light to occur. ii. The critical angle for a transparent substance is 39^\circ. Calculate the refractive index of the substance.

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. How far is he from the hill? [ speed of sound in air = \(340ms^{-1}\)

The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at

In a compound microscope, the objective and the eye piece focal lengths are