Question

Answer both please

How many photons per second are emitted by a 5.5-W LED light bulb, if the emission is at a wavelength of 550 nm? O 1.23E22 photons/s 05.07E21 photons/s O 3.62E19 photons/s O 1.52E19 photons/s 4.27E19 photons/s Question 11 5 pt A square planar loop of coiled wire has a length of 0.25 m on a side and is rotated 60 times per second between the poles of a permanent magnet. The magnetic field between the poles is 0.75 T. If a peak voltage of 1 kV is generated in the coil, how many turns does it have? O 56 turns O 25 turns O 60 turns 0 120 turns 1000 turns

Answer 1

Wavelength a=550nm =550x10m Enengy each photon he 6+62x10 34 x 3x108 550 x 109 त्र - 3.61 xıöls photons/ Number pot photons emi Hed per second n = Р Power E P: 5.5 W 5.5 3.6181019 = 1.52x1019 photons, 1s no 1-52 E19 117 area enclosed by one tunn A= Angular relocity 60 nev/s = 60 82 T riad/s Magnetic field B = 0.75T Peak roltage E = I KV = 1x103 y We know Į = NABW N ABW f. 25m2 1x103 (0.25) ? x 0.75% 60x27 =56 Number of turns = 56 IN CSscanned with CamScanner