pls tell ans if u know army's
which is the darkest pencil in the set of hb 2b and that others
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B9 is the softest and darkest. 9H is the lightest and hardest graphite pencil. So a B6 is softer and darker than a B2.
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A Sonar apparatus in a ship sends out a signal vertically downwards. The signal returns after 1.6 s. Find the depth of the sea. The velocity of sound in water = 1500 m/s.
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