The intensity level of one horn is 70 dB. What is the intensity level of two hor

Question

The intensity level of one horn is 70 dB. What is the intensity level of two horns? a) 70 dB b) 73 dB c) 76 dB d) 89 dB e) 140 dB The driver of a car blows the horn as the car approaches a pedestrian in a crosswalk. Compared to the actual frequency of the horn, the pitch observed by the pedestrian is ___. a) lower b) higher c) the same When sound passes from air into water a) its wavelength docs not change. b) its frequency does not change. c) its velocity docs not change. d) all of the above arc true. An electric bell connected to a battery is sealed inside a large jar. What happens as the air is removed from the jar? a) The electric circuit stops working because electromagnetic radiation can not travel through a vacuum. b) The bell's pitch decreases because the frequency of the sound waves is lower in a vacuum than in air. c) The bell's loudness increases because of decreased air resistance. d) The bell's loudness decreases because sound waves can not travel through a vacuum. An object is placed as shown in live figure above the center of curvature C and the focal point F of the reflecting surface are marked. As compared with the object, the invade formed by the reflecting surface is a) erect and larger b) erect and the same size c) erect and smaller d) inverted and larger e) inverted and smaller An object is placed at a distance of 1.5f from a converging lens of focal length f, as shown above. What type of image is formed and what is its size relative to the object? a) Virtual b) Virtual c) Virtual d) Real e) Real

Explanation / Answer

Everytime we doubles the intensity is increased by 3dB

1 horn=70dB

2 horn=73dB<-----Answer

4 horn=76dB

8 horn=79dB

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