Port-wine birthmarks can be removed by expose to 585 nm laser light. pulses are strongly absorbed by oxyhemoglobin in the capillaries in the birthmark, destroying them. a typical laser pulse lasts for 1.5 ms, and contains an energy of 7.0 j a. find the frequency and energy of each laser photon. b. how many photons are in each pulse in the given duration (1.5 ms)? explain if the numeric scale makes sense to you.

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

15.3 cos 65 degrees trig

the bal will not change its velocity.