The brightness producing capacity of a source (a) does not depend on its power (b) does not depend on the wavelength emitted

Gravitational force. This force depends on the product of the masses of the planet and sun and the distance between them. 

When certain metals like magnesium, aluminium, etc., are exposed to air, they form an oxide film on their surface. Thus, the surface lose its brightness when kept in air for a...

(d) separation between the source and the observer. EXPLANATION:  The apparent frequency due to the Doppler effect ν' = {V/(V-U)}*ν₀  or ν' = {(V+U)/V}*ν₀ depending upon the source moves towards the observer...

Overall luminous efficiency =Total luminous flux / Power input =35x685/100 = 239.75 lumen/W

(d) total luminous flux entering the eye.

(b) The luminous efficiency of a monochromatic source of wavelength 555 nm is always greater than that of a white light source of same power. (c) The illuminating power of a...

(a) the number of photons emitted by the source in unit time increases (b) the total energy of the photons emitted per unit time increases

(3) According to Hardy Schulze rule : The coagulating power of an ion depend on both magnitude and sign of the charge of the ion.

(a) Albedo is the fraction of the incident sunlight that is reflected. When an object reflects most of the light that hits it and looks bright then it has high...

(a) According to the data of 2000, the power generation is 95000 MW. Nuclear plants contribute 2% of total power generation. Hydroelectricity plants contribute 25% of total production and 73% is...