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An aircraft is flying at a ground speed of 200 km/h. The focal length of the camera is 200 mm. The ground distance covered is 200 mm. The ground distance covered along the flight line between exposures is 2 km. The time interval between exposures is given by
  • a)
    18 sec
  • b)
    36 sec
  • c)
    72 sec
  • d)
    180 sec
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
An aircraft is flying at a ground speed of 200 km/h. The focal length ...
Time interval betw een exposures (sec) = 3600L/V where L is ground distance covered between exposures along the flight line is km and V is the ground speed of the aircraft in km/h.
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Most Upvoted Answer
An aircraft is flying at a ground speed of 200 km/h. The focal length ...
Given Information:
Ground speed of the aircraft = 200 km/h
Focal length of the camera = 200 mm
Ground distance covered = 200 mm
Ground distance covered along the flight line between exposures = 2 km

To find: Time interval between exposures

Formula used:
Ground distance covered = Focal length of the camera x Altitude of the aircraft
Time interval between exposures = Ground distance covered along the flight line between exposures / Ground speed of the aircraft

Explanation:
1. Let the altitude of the aircraft be 'h' km
2. Ground distance covered = Focal length of the camera x Altitude of the aircraft
=> 200 mm = 200 x h km
=> h = 0.001 km
3. To convert km/h to m/s, multiply by 5/18
=> Ground speed of the aircraft = 200 x 5/18 m/s = 55.56 m/s
4. Ground distance covered along the flight line between exposures = 2 km = 2000 m
5. Time interval between exposures = Ground distance covered along the flight line between exposures / Ground speed of the aircraft
=> Time interval between exposures = 2000 / 55.56 = 36 s

Therefore, the time interval between exposures is 36 seconds.
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An aircraft is flying at a ground speed of 200 km/h. The focal length of the camera is 200 mm. The ground distance covered is 200 mm. The ground distance covered along the flight line between exposures is 2 km. The time interval between exposures is given bya)18 secb)36 secc)72 secd)180 secCorrect answer is option 'B'. Can you explain this answer?
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