Question

Energy of a photon having wavelength 3000 nm will be (h = 6.626 × 10–34 js)

Answer 1

It may be a correct answer .

Answer 2

Energy of photon is 6.626 × ${10}^{ - 20}$ J

Given - Value of h and wavelength

Find - Energy of photon

Solution - Energy of photon can be calculated by the formula -

Energy = planck's constant × frequency

Also, frequency is given by the formula -

Speed of light = frequency × wavelength

So, the on combining the two equations, we get equation of energy as -

Energy = planck's constant × speed of light /wavelength

Now, converting wavelength to metres.

As per the known fact, 1 nm = ${10}^{ - 9}$ m

So, 3000 nm = 3 × ${10}^{ - 6}$ m

Keep the values in formula to find the energy of photon

Energy = $\frac{6.626 \times {10}^{ - 34} \times 3 \times {10}^{8} }{3 \times {10}^{ - 6} }$

On solving we get the energy of photon as -

Energy = 6.626× ${10}^{ - 20}$ J

Hence, the energy of photon is 6.626 × ${10}^{ - 20}$ J

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