Options: absorption of corresponding wavelengths by the outer layers of the sun, destructive interference between waves of certain definite wavelengths, absorption of corresponding wavelengths by the prism used in the photograph, absence of corresponding wavelengths from the light emitted by the core of the sun
Which of the following pairs of country and the purpose for which U.N. Peace Keeping Force is maintained is correctly is correctly matched?
Options: Cyprus - to maintain peace between the two dominant ethnic groups in the country, Mozambique - To supervise a referendum, El Salvador - to deliver humanitarian aid, Lebanon - For supervising a 1992 accord
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that
Options: the clear sky allows radiant energy to escape readily from the earth, on a cloudy night the clouds are warm and therefore retard the cooling, the clear sky allows the cold of outer space to reach the earth, current of air carry the heat away from the earth on a clear night