The energy flux of sunlight reaching the surface of the earth is 1.388 × 103 Wm -2. Assuming the sunlight average wavelength as 550 nm, how many photons (nearly) per square metre are incident on the earth per second.

Question

The energy flux of sunlight reaching the surface of the earth is 1.388 × 103 Wm -2. Assuming the sunlight average wavelength as 550 nm, how many photons (nearly) per square metre are incident on the earth per second. (A) 2 × 1021 photons m -2 s -1 (B) 3 × 1021 photons m -2 s -1 (C) 4 × 1021 photons m -2 s -1 (D) 5 × 1021 photons m -2 s -1

Tardigrade Admin · Accepted Answer

E text photon =(h c/λ)=(1242 eV - nm /550 nm )=2.26 eV P=N E ; (N/A)=((P/A)) (1/E) Photons per second per unit area =(1.388 × 103 W / m 2/(2.26 × 1.6 × 10-19 J ))=3.8 × 1021 ≈ 4 × 1021 photons m -2 s -1

Q. The energy flux of sunlight reaching the surface of the earth is $1.388 \times 1 0^{3} W m^{- 2}$ . Assuming the sunlight average wavelength as $550 nm$ , how many photons (nearly) per square metre are incident on the earth per second.

$2 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$

$3 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$

$4 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$

$5 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$

Q. The energy flux of sunlight reaching the surface of the earth is 1.388×103Wm−2. Assuming the sunlight average wavelength as 550nm, how many photons (nearly) per square metre are incident on the earth per second.

2×1021 photons m−2s−1

3×1021 photons m−2s−1

4×1021 photons m−2s−1

5×1021 photons m−2s−1

Ephoton ​=λhc​=550nm1242eV−nm​=2.26eV P=NE;AN​=(AP​)E1​ Photons per second per unit area =(2.26×1.6×10−19J)1.388×103W/m2​=3.8×1021 ≈4×1021 photons m−2s−1

Q. The energy flux of sunlight reaching the surface of the earth is $1.388 \times 1 0^{3} W m^{- 2}$ . Assuming the sunlight average wavelength as $550 nm$ , how many photons (nearly) per square metre are incident on the earth per second.

$2 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$

$3 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$

$4 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$

$5 \times 1 0^{21}$ photons $m^{- 2} s^{- 1}$