Suppose that a light intensity of 25W/m2 causes a current of 4×10-5A to flow in a photocell. How much current will flow if the intensity is increased to 100W/m2?

(A) 1×10-5A --- (B) 4×10-5A

(C) 8×10-5A --- (D) 16×10-5A

Questions --- What this question is about
117.4

































Suppose that a light intensity of 25W/m2 causes a current of 4×10-5A to flow in a photocell. How much current will flow if the intensity is increased to 100W/m2?

(A) 1×10-5A --- No.

Multiply by the factor.

Try again.
Questions --- What this question is about
117.4

































Suppose that a light intensity of 25W/m2 causes a current of 4×10-5A to flow in a photocell. How much current will flow if the intensity is increased to 100W/m2?

(B) 4×10-5A --- No.

The current does depend on intensity.

Try again.
Questions --- What this question is about
117.4

































Suppose that a light intensity of 25W/m2 causes a current of 4×10-5A to flow in a photocell. How much current will flow if the intensity is increased to 100W/m2?

(C) 8×10-5A --- No.
The intensity has increased
by a factor of 100/25 = 4.

Try again.
Questions --- What this question is about
117.4

































Suppose that a light intensity of 25W/m2 causes a current of 4×10-5A to flow in a photocell. How much current will flow if the intensity is increased to 100W/m2?

(D) 16×10-5A --- Yes.
The intensity is up by a factor of 100/25 = 4,
so the current also increases by a factor of 4.

Check the other answers.
Questions --- What this question is about
117.4