Question

A laser used to attach the detached retains has a Frequency of
4.69x10'4 sec. Find its wavelength ?
1) 3400 A
3) 4600 A
4) 4300 4°
2) 6400 A​

Answer 1

Answer:

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Explanation:

Energy of photon =

λ

hc

=

652nm

1240eV−nm

(hc=1240eV−nm)

=1.9eV

Energy = Power × time

=0.6×20×10

−3

×

1.6×10

−16

1

=7.5×10

16

eV

Answer 2

Answer:

your ans is 6400A°

Explanation:

wave length =velocity of light/frequency

velocity of light = 3×10^8 m/sec

wave length =3×1020^8÷4.69×10^14

=0.639×10^-6 =6400A°