Mountain Waves: DGCA Aviation Meteorology questions

For mountain waves to form there should be flow of air across the ridge, generally within ............ of the perpendicular to the ridge.

For mountain waves to form the wind speed for small mountains should be atleast

For mountain waves to form the wind speed for large mountains should be atleast

For mountain waves to form there should be ..... air below the ridge and less stable air above.

The worst kind of turbulence is encountered in the vicinity of rotor clouds.