9 02 points | Premious Anewers SerPSET9 38 P015 My Notes Ask Your Tea A large ha

Question

9 02 points | Premious Anewers SerPSET9 38 P015 My Notes Ask Your Tea A large hall in a museum has a niche in one wall, On the floor plan, the niche appears as a semicircular indentation of radius 2.55 m. A tourist stands on the centerline of the niche, 2.03 m out from its deepest point, and whispers Hello. Where is the sound concentrated after relection from the niche? Your response differs from the correct answer by more than 10%. Double check your calculations. m from the deepest point in the niche Need Help?d 10. 2.516 points I Previous Answers ScrPSET9 36.P.02 My Notes Ask Your Tea An object 11.0 cm tall is placed at the zero mark of a meterstick. A spherical mirror located at some point on the meterstick creates an image of the object that is upright 4.00 cm tall, and located at the 44.0-cm mark of the (a) Is the mirror convex or concave? convex concave (b) Where is the mirror? At the x em mark.What kind of mirror produces an upright and diminished image? (c) What is the mirror's focal length?

Explanation / Answer

(9) The niche will act like a concave mirror

r=2.55m, so f=r/2= 2.55/2=1.275 m

do= 2.03 m

using mirror formula

1/f= 1/do+1/di

1/1.275= 1/2.03+1/di

di= 3.43 m

so the sound is concentarted at 3.43 m from the deepest point

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