Physics, asked by spone, 21 days ago

A lamp hangs at a height of 4.0 m above a table. The lamp is lowered by 100 cm. The illuminance on the table increases by __%.​

Answers

Answered by SarcAsticsoNa
1

The only change when lamp moves from 4 m to 3 m is its d

Illuminance at 4 m = Power / 16

Illuminance at 3 m = Power / 9

Increase in Illuminance =

power / 9 - power/16 = 7power/144

so% increase = 7 power / 144 × 16×100/power

= 77.77%

= 78%

Attachments:
Similar questions