What is the wavelength of a photon of red light (in nm) whose frequency is 4.56 × 1014 hz?

To calculate the wavelength of the light, we use the relation between wavelength, speed of light and frequency as

Here, is the wavelength of the light , is the frequency of the light is the speed of light.

Given and

Substituting these values in above relation, we get

In nano meter,

Thus, the wavelength of photon of the red light is 657.89 nm.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

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