Which one of the following types of waves are used in a night vision apparatus?
The blue colour of the clear sky is due to
The weight of an object will be minimum when it is placed at ?
The weight of an object is minimum when it is placed at the center of the earth because when an object is in the center, it experiences gravitational pull from all directions.
As you go down into a well, your weight
In fireworks, the green flame is produced because of
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