If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?
In a good thermos flask, heat loss is reduced through the following features EXCEPT?
Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length
The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?
I. Total internal reflection of light.
II. Conservation of light energy.
III. Relative motion of the earth, sun and moon.
IV. Rectilinear propagation of light.
which of the above is a phenomenon of total solar eclipse?
