Physics
(a) Name the radiations :
- for which a quartz prism is used to study the spectrum.
- which are used in remote sensing devices.
- which are used in traffic signals in India.
(b) Name one property common to all electromagnetic radiations.
Related Questions
An object is placed in front of a concave lens at a distance of 45 cm from it. If its image is formed at a distance of 30 cm from the lens, calculate the focal length of the lens.
Two rays PQ and RS are incident on a rectangular glass block as shown in the diagram. Observe the diagram and answer the questions that follow.
Which of these two rays will :
(a) have greater lateral displacement on emerging out of the block?
(b) travel with greater speed in the block?
(c) scatter more in the atmosphere?
Akash takes a uniform metre scale and suspends a weight of 2 N at one end ‘X’, and a weight of 5 N on the other end ‘Y”. He then balances the ruler horizontally on a knife edge placed at 70 cm from X. Draw a diagram of the arrangement and calculate the weight of the ruler.
Three levers X, Y, Z of equal lengths are shown in the diagram.
(a) Which class of lever do these belong to?
(b) Among these (X, Y or Z) which one will give the maximum mechanical advantage? Justify your answer.