Radioactivity — Physics STD 10 — Question

Define Velocity Ratio

State one difference between a musical note and a noise.

(a) A wire bent into a circle, carries current in an anticlockwise direction. What polarity does this face of coil exhibit?
(b) Why does a magnetic needle show a deflection when brought close to a current carrying conductor?

A substance undergoes (i) a change in its temperature, (ii) a change in its phase without change in its temperature. In each case, state the change in energy of molecules of the substance.

It is generally cold after a hail-storm then during and before the hail storm. Give reason.

A monochromatic ray of light passes from air to glass. The wavelength of light in air is λ, the speed of light in air is c and in glass is ν. If the absolute refractive index of glass is 1.5, write down (a) the relationship between 𝒸 and ν, (b) the wavelength of light in glass.

The secondary windings of a transformer in which the voltage is stepped down are usually made of thicker wire than the primary. Explain why.

(a) What do you understand by the term latent heat of fusion?
(b) Why does the temperature remain constant during the fusion of a substance?

Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.

On what factors does the work done by a force depend?