Find the minimum aperture diameter of a camera that can resolve detail on the ground the size of a person (2.0 m ) from an sr-71 blackbird airplane flying at an altitude of 29 km . (assume light with a wavelength of 450 nm .)

Minimum aperture diameter, B =

Given:

Altitude of airplane, l = 29 Km = 29000 m

width, d = 2.0 m

wavelength,

Solution:

By Reighley criterion, Angle of resolution is given by:

                           (1)

Also, separation angle or limiting angle,        (2)

From eqn (1) and (2):

B = 7.96 mm

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.