A lamp is hanging along the axis of a circular table of radius r. at what height should the lamp be placed above the table so that the intensity of il

Question

A lamp is hanging along the axis of a circular table of radius r. at what height should the lamp be placed above the table so that the intensity of il

A lamp is hanging along the axis of a circular table of radius r. at what height should the lamp be placed above the table so that the intensity of illumination at the edge of the table is `(1)/(8)` of that at its centre ?

Monjur Alahi

7 views

2025-01-04 04:42

1 Answers

Related Questions

A bar magnet is kept along the axis of a conducting loop. When the magnet is moved along the axis, a current is seen in the loop. Which force is respo

2 Answers 5 Views

A lamp of luminous intensity 50 candela is placed at a distancde of 1 m from a wall What is the illuminacnce of the wall directly in front of lamp ? I

2 Answers 6 Views

A small lamp having the from of a unifromly sphere of radius R=6 cm is suspended at a height h=3m above the floor. The luminance of the lampis equal t

2 Answers 5 Views

A long thin wire is placed along the y-axis (just outside) of a frame of refernce. There exists a uniform magnetic field of `10^(-6)` T along the x-ax

2 Answers 5 Views

A circular loop of radius 10 cm carries a current of 15A. At its center is placed a small loop of radius 1cm with 50 turns and a current of 1A. A) wha

2 Answers 4 Views

A circular coil `P` of `100` turns and radius `2cm` is placed coaxially at the center of another circular coil `Q` of `100` turns and radius `20cm` .

2 Answers 9 Views

A ball hanging from a beam is balanced against weighta placed on the other pan. Another ball is so placed that its centre is 2 cm vertically below the

2 Answers 9 Views

A 60W lamp is rated at 0.8 watt/candela. Calculate (i) luminous intensity of the lamp, (ii) luminous flux of the lamp, and (iii) illuminance at a dist

2 Answers 4 Views

An electric bulb is hanging above the centre of a circular table of radiys 3m at a height of 3m from the its centre. Find the ratio of illuminance at

2 Answers 5 Views

A concave lens focal length 10 cm is placed on the axis of concave mirror of 10 cm radius at a distance of 5 cm from the mirror. An object is placed s

2 Answers 6 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - `h = r//sqrt(3)`

7 views Answered 2023-02-05 15:29