A 1,150 lumen light bulb is placed 37 cm in front of a mirrored wall, whose reflectance is 0.88. What would be the illuminance at the brightest spot on the opposite wall, 2 m away from the mirrored wall?
A 1,150 lumen light bulb is placed 37 cm in front of a mirrored wall, whose...
A 1,730 lumen light bulb hangs from a tree limb 3 m above the ground? A. What is the luminance intensity of that light bulb? B. What is the illuminance on the ground at the brightest point (right under the light bulb)? C. What is the illuminance on the ground, three meters away from the brightest point?
lamp 120 12° 0.7 m 5.0 m ground 1.A bicycle light bulb runs off a 6.0 volt battery, and draws a current of 0.50 ampere. 80% of the electrical power input is converted into radiant output, with a luminous efficacy of 16 lumen/watt. A reflector directs all the light from the bulb into a uniform cone of light, of half-angle 12°. The lamp is mounted on a bicycle at a height of 0.70 m above the ground, and the centre...
A light bulb is placed upright 30 cm away from a convex mirror. The radius of curvature of the mirror is 52 cm. What is its focal length? What is the image distance? What is the magnification of the image? Is the image real or virtual?
An absorbing panel has to be placed in front of a sound reflecting wall. At what distance from the wall should the panel be placed so that it would be most effective in absorbing sound whose frequency is 773 Hz? (Assume the speed of sound to be 343 m/s. Include units in your answer =? m.
A small bulb is placed in front of a convex lens Suppose that the bulb is placed as shown. Using all three principal rays, draw an accurate ray diagram to determine the location of the image. Label the image location. Small bulb b. Repeat part a for the case shown at right, in which the bulb is farther from the lens. Small bulb bangladov Lens c. Suppose that in each case above you were to place a small paper screen...
20. An absorbing panel has to be placed in front of a sound reflecting wall what distance from the wall should the panel be placed so that it would be me effective in absorbing sound whose frequency is 250 Hz?
1.A laser is placed in the center of a room with one mirrored
wall and ceiling as shown. At what angle, θ, should the beam be
pointed so that it impacts three quarters of the way up the right
wall? The room is x = 4.70 m long, and y = 3.60 m high.
[ans. 32.6 deg]
2.An ant is positioned between a 0.38 m tall vertical mirror and
a distant tree. When the ant looks toward the mirror, the...
A conducting rod whose length is l = 30 cm is placed on a U-shaped metal wire that is connected to a light bulb having a resistance of 5.0 s as shown in the figure. The wire and the rod are in the plane of the page. A constant uniform magnetic field of strength 0.50 T is applied perpendicular to and out of the paper. An external applied force moves the rod to the left with a constant speed of...
please show steps
Two plates, one black (perfectly absorbing) and one mirrored (perfectly reflecting), are affixed one at each end of a 9 cm rod, which is then suspended at its center from a torsion balance (see figure below). The plates are squares whose sides are of length 0.5 cm. A point light source is then placed at a distance 5 m away from the rod, as shown below. The point light source radiates an average power of 41 kW....
q3-4
Chapter -25 The Reflection of Light: Mirrors 3 - A coin is placed in front of a concave mirror that has a radius of curvature R-0.50 m The image of the coin is inverted and is five times larger than the size of the object. Determine the distance between the coin and the mirror (de). a) 0.10 m b) 0.15 m c) 0,20 m d) 0.30 m e) 0.45 m 4 - A concave mirror of radius R-54 em...