1.)A photon has a wavelength of 1.95 x10^-11 m. What is the frequency? a.)Using your answer, find the energy of that photon

Explanation:

Given parameters:

Wavelength of photon = 1.95 x 10⁻¹¹m

Unknown:

Frequency of the wave  = ?

Energy of the photon = ?

Solution:

The frequency and wavelength of a wave are related by the expression;

   C = Fλ

C = speed of light  = 3 x 10⁸m/s

F = frequency

λ = wavelength

 Insert the parameters and solve;

    3 x 10⁸  = F x 1.95 x 10⁻¹¹

       F  =   = 1.54 x 10¹⁹Hz

Energy of the photon is related to frequency using the expression below;

  E  = hF

h is the Planck's constant = 6.634 x 10⁻³⁴m²kg/s

Insert the parameters and solve;

    E = 6.634 x 10⁻³⁴ x 1.54 x 10¹⁹   = 1.02 x 10⁻¹⁴J

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.