A boy focusses a sharp image of a distant object on a screen using a lens. The distance between the approximately equal to?
Af/3
B2f
Cf
Df/2
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From the following, identify the applications of scattering of light?
- (a) Danger signals being red
- (b) Advanced sun rise and delayed sun set
- (c) Twinkling of stars
- (d) Tyndall effect
- (e) Redness of sun and blueness of sky
Which type of wall is present in the closed system?
A current of 5 A flows through a conductor having resistance 2Ω . The potential difference (in volt) across the ends of the conductor is?
Which of the following statements is are true for a number of resistors connected in parallel combination?
- (1) All the resistors are connected between two given points.
- (ii) The equivalent resistance of the circuit is more than the individual resistance.
- (iii) The potential difference across each resistor is same.
Hooke's law establishes the relationship between which two physical quantities in elastic materials?