A water wave of frequency 20hz has a velocity Of 24ms¹ it enters the shallow region at an angle of incident of 45 and speed recluces to 18ms² calculate (A) Refractive index (b)Angle of refraction (c) wave length of water wave in the shallow region. .

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery