In lasik surgery, a laser is used to reshape the cornea of the eye to improve vision. the laser produces extremely short pulses of light, each containing 1.0 mj of energy. part a in each pulse there are 9.7×1014 photons. what is the wavelength of the laser?

To solve this problem it is necessary to apply the related concepts laser pulse energy.

By definition the energy of a laser pulse in terms of number of photons is

Where,

Wavelength

N = Number of photons in each laser pulse

h = Planck constant

c = Speed of light

We need to find the wavelength, then re-arrange the equation we have

Converting the unit the energy from J to eV, we have

Replacing,

Therefore the wavelength of the laser is 182.4nm

Note: The Planck constant used is in units of eV.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: