| Column A | Column B |
| (P) Radiant flux | (1) Dimensionless |
| (Q) Radiant energy | (2) Watts |
| (R) Radiant Exitance | (3) Joules |
| (S) Reflectance | (4) Watts $m^{ -1}$ |
| (5) Watts $m^{ -2} s ^{ -1}$ |
In a Survey of India topographic map of scale 1:50,000, the contours are drawn conventionally at intervals of __________ m.
The reflectance geometry of white-sky albedo can be represented as __________
Clouds appear white in optical visible spectral bands of remote sensing images due to _________ scattering.
If the emissivity of an object varies with wavelength, it is called as __________