Free Printable PHOTOELECTRIC EFFECT

1.

Photoelectric effect provides the evidence for the ______ nature of radiation.

a)

wave

b)

dual

c)

electromagnetic

d)

particle

2.

Light of a given wavelength is used to illuminate the surface of a metal. However, no photoelectrons are emitted. In order to cause electrons to be ejected, light of __________ should be used.

a)

higher intensity

b)

shorter frequency

c)

lower energy

d)

higher frequency

3.

Use the graph to find the threshold frequency.

a)

2×10¹⁵ Hz

b)

4×10¹⁵ Hz

c)

0 Hz

d)

−12×10^-19 Hz

4.

The energy of photoelectrons emitted from a metal surface can be increased by ________.

a)

using light of higher intensity

b)

using light of higher frequency

c)

using light of longer wavelength

d)

using monochromatic, polarized light

5.

This image is an illustration of_______.

a)

Bohr model

b)

quantum mechanical model

c)

photoelectric effect

d)

Dalton's atomic theory

6.

Give the equation of threshold frequency.

a)

$f_0=\frac{W_0}{h}$

b)

$f_0=\frac{h}{W_0}$

c)

$f_0=W_0-h$

d)

$f_0=W_0h$

7.

What is the energy of a photon with a frequency of 7x10¹⁴ Hz?

$E=hf$

a)

4.6x10^-19 J

b)

3.3x10^-19 J

c)

5.0x10^-19 J

d)

2.5x10^-19 J

8.

Cadmium has a work function of 4.22 eV. Calculate its threshold frequency. $W_0=hf_0$

$\left(1eV=1.60\times10^{-19}J\right)$

a)

1.02×10¹⁵ Hz

b)

5.75×10¹⁵ Hz

c)

3.06×10¹⁵ Hz

d)

8.02×10¹⁵ Hz

9.

The energy of a photon from an electromagnetic wave is 2.25 eV. Calculate its wavelength.

$E=\frac{hc}{\lambda}$

$\left(1eV=1.60\times10^{-19}J\right)$

a)

765 nm

b)

7.65×10^-26 m

c)

552 nm

d)

5.52×10^-26 m

10.

In a photoelectric effect experiment it is observed that no current flows when the wavelength of EM radiation is greater than 570 nm. Calculate the work function of this material in electron- volts in eV.

$W=\frac{hc}{\lambda}$

$\left(1.60\times10^{-19}J=1eV\right)$

a)

1.09 eV

b)

6.54 eV

c)

8.72 eV

d)

2.18 eV

PHOTOELECTRIC EFFECT

Total questions: 10

Worksheet time: 17mins

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