Light with an energy flux of 18 W cm⁻² falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm², the average force exerted on the surface during a 30 minute time span is
A
2.1 × 10⁻⁶ N
B
1.2 × 10⁻⁶ N
C
1.2 × 10⁶ N
D
2.1 × 10⁶ N

Question

Light with an energy flux of 18 W cm⁻² falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm², the average force exerted on the surface during a 30 minute time span is

A

2.1 × 10⁻⁶ N

B

1.2 × 10⁻⁶ N

C

1.2 × 10⁶ N

D

2.1 × 10⁶ N

Accepted Answer

1.2 × 10⁻⁶ N

Answer

2.1 × 10⁻⁶ N

Answer

1.2 × 10⁶ N

Answer

2.1 × 10⁶ N

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