Physics

Problem

Two identical photocells are illuminated separately by monochromatic light sources

P

and

Q

. The observed data are: • For source

P

: stopping potential

1.5\,\text{V}

, saturation current

4\,\mu\text{A}

. • For source

Q

: stopping potential

2.0\,\text{V}

, saturation current

4\,\mu\text{A}

. Which statement about the two light sources is correct? a)

\nu_P>\nu_Q

and intensities of

P

and

Q

are equal b)

\nu_P<\nu_Q

and intensity of

P

is greater than that of

Q

\nu_P<\nu_Q

and intensities of

P

and

Q

are equal d)

\nu_P = \nu_Q

and intensity of

P

is less than that of

Q