Force, Work, Power and Energy — Physics STD 10 — Question

What is the condition necessary for an echo to be heard distinctly?

(a) Name the high energetic invisible electro-magnetic wave which helps in the study of structure of crystals.
(b) State one more use of the wave named in part (a).

How does the intensity of scattered light depend on the wavelength of incident light? State conditions when this dependence holds.

A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?

State two advantages of using a right-angle prism as a reflector, rather than a plane mirror.

A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is stretched to double its length?

(a) Explain how is land breeze caused.
(b) Why is the weather in coastal regions moderate?

An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the current through the filament of the bulb.

Why should a radioactive substance not be touched by hand?

State one important advantage and disadvantage each of using nuclear energy for producing electricity.