Under what condition will a set of gears produce:
1. a gain in speed.
2. a gain in torque1. For gain in speed: Number of teeth in driving wheel is greater than the number of teeth in the driven wheel.
2. For gain in torque: Number of teeth in driven wheel is greater than number of teeth in driving wheel.
A ray of light moves from a rarer medium to a denser medium as shown in the diagram given below:
Write down the number of the ray which represents the partially reflected ray.
You are provided with a printed piece of paper. Using this paper how will you differentiate between a convex lens and a concave lens?
A converging lens is used to obtain an image of an object placed in front of it. The inverted image is formed between F2 and 2F2 of the lens.
i) Where is the object placed?
ii) Draw a ray diagram to illustrate the formation of the image obtained?A ray of light incident at an angle of incidence ‘I’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
i) How is the angle of emergence 'e' related to the angle of incidence ‘I’?
ii) What can you say about the value of the angle of deviation in such a situation?i) What is meant by the dispersion of light?
ii) In the atmosphere which colour of light gets scattered the least.Which characteristics of sound will change if there is a change in:
i) its amplitude
ii) its waveformi) Name one factor which affects the frequency of sound emitted due to vibrations in an air column.
ii) Name the unit used for measuring the sound level.