Solar radiations fall on Earth's surface at a rate of `1400 W//m`?. Assuming that the radiation has an average wavelength of 550 nm, how many photos per square meter per second fall on the surface?

Explanation

To find the number of photons per square meter per second falling on the Earth's surface due to solar radiation, we can follow these steps:

### Step 1: Understand the given data
- Power (P) = 1400 W/m² (this is the rate at which solar energy is received)
- Wavelength (λ) = 550 nm = 550 x 10⁻⁹ m (convert nanometers to meters)
- Planck's constant (h) = 6.626 x 10⁻³⁴ J·s
- Speed of light (c) = 3 x 10⁸ m/s

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