A light of wavelength `3200overset(@)A` is coming from a star. What is the limit of resolution of a telelscope whose objective has a diameter of 86 inch?

What is blue shift? Sodium light of wavelength 589.0overset(@)A travelling from a galaxy is observed to be 589.6overset(@)A . What is the speed of the galaxy?

A photo electric surface has work function 2eV. What is the maximum kinetic energy of the emitted photoelectrons ejected by light by wavelength 3000overset(@)A Given h=6.6xx10^(-34)J-S,e=1.6xx10^(-19)C . m_e=9g0^(-31)kg,C = 3xx10^8m//sec

A company packages its milk powder in cylindrical container whose base has a diameter of 14 cm and height 20 cm. Company places a label around the surface of the container (as shown in the figure). If the label is placed 2 cm from top and bottom, what is the area of the label.