Recent questions tagged principles of photometry

+1 vote

1 answer

Can a virtual image be photographed by a camera ?

asked Mar 7, 2019 in JEE by kratos

+1 vote

1 answer

A particle in the solar system is under the combined influence of the sun’* gravitational attraction and the radiation force

asked Mar 6, 2019 in JEE by kratos

+3 votes

1 answer

At what distance apart should the poles for street lamps be placed so that the illumination on

asked Dec 6, 2018 in JEE by kratos

+3 votes

1 answer

Intensity of sun'* radiation is about A. 1.0 kW m^-2 B. 20 kW m^-2

asked Nov 20, 2018 in JEE by kratos

+2 votes

1 answer

An electric lamp of 100 candela requires 0.5 W of energy per candela.

asked Jul 18, 2018 in JEE by kratos

+2 votes

1 answer

If an average person jogs, he produces 14.5 × 10^3 cal per minute.

asked Jun 17, 2018 in JEE by kratos

+1 vote

1 answer

During construction work in the tunnel of an underground railway, an electric lamp was placed at the upper point of the arch^ (Fig.).

asked Jun 7, 2018 in JEE by kratos

+2 votes

1 answer

An object is photographed at a large distance. The same object is again photographed at a small distance,

asked May 3, 2018 in JEE by kratos

+2 votes

1 answer

Compare the following (i) Wavelengths of the incident solar radiation absorbed by the earth’* surface and the radiation

asked Mar 3, 2018 in Physics by kratos

+2 votes

1 answer

Every minute, 1 cm2 of the Earth'* surface receives approximately 1.94 cal of energy from solar radiation (when the Sun'* rays are perpendicular).

asked Feb 10, 2018 in JEE by kratos

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