Uma Câmara escura de orifício com 15 cm de profundidade produz uma determinada imagem para um objeto situado a 10 m do orifício. Qual a profundidade de uma câmara escura que, colocada a 20 m do mesmo objeto e produz uma imagem igual ao dobro da anterior? a) ( ) 30 cm b) ( ) 7,5 m c) ( ) 7,5 cm d) ( ) 30 m e) ( ) 60 m

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

A( developed during the process of technology design

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.