Select the correct answer. A periodic wave travels from one medium to another. Which pair of variables are likely to change in the process?
O A. velocity and wavelength
OB. velocity and frequency
OC frequency and wavelength
OD
frequency and phase
OE wavelength and phase

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

i'm on my way to history not a mistory.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min