High school Grade 12 physics question

Physics 30 Unit 4 Electromagnetism Exam Part B

Name: __________________ Date: ________________ Written Response #1 Use the following information to answer the next question.

• Describe two experiments or observations which show EMR behaving like a wave. Explain how the observed behaviors are ‘wave-like’. (2 marks)

• Describe two experiments or observations which show EMR behaving like a particle. Explain how the observed behaviors are ‘particle-like’. (2 marks)

Electromagnetic radiation (EMR) has been modeled by physicists as a wave and as a photon which has both wave and particle characteristics.

2

Written Response #2 Name: ______________ Zoe conducted an experiment to determine the focal length of a convex lens. She used an optics bench to illuminate an object and project a real image of it onto a screen and recorded the data in the chart below:

Object Distance

(cm)

Inverse of distance to object

(cm-1) Image Distance

(cm) Inverse of distance

to image (cm-1)

25.0

100.0

27.0

77.1

31.0

56.4

35.0

46.7

42.0

38.2

• Complete the above chart (2 marks)

Optics Bench

Illuminated Object

Convex Lens Screen

3

• Graph the data to produce a straight line. Be sure to include: (3 marks)

o Labels for the x and y axes, including correct units , and o a title

• Use the graph to determine the focal length of the convex lens. (2 marks)

4

Written Response #3 Name: ______________ Use the following information to answer the next question

You must completely analyze the data and identify the metal. In your response,

• Identify the region of the electromagnetic spectrum to which the incident frequency radiation belongs. (1 mark)

• Provide a graph of the results on the next page. (3 marks) • Determine the value, with units, of the slope. Identify the significance of the

slope. (2 marks)

Name: ______________

A student performed a photoelectric effect experiment in which he exposed an unidentified metal to various frequencies of incident electromagnetic radiation and measure the stopping voltage of the emitted photoelectrons. He calculated the maximum kinetic energy of the emitted photoelectrons. His results are given in the table below. Frequency of incident electromagnetic

Radiation (1015 Hz) 1.3 1.4 1.5 1.6 1.7 1.8

Maximum kinetic energy of emitted Photoelectrons (10-19 J)

1.0 1.8 2.4 3.1 3.8 4.4

The teacher provided the student with the following table of work functions for selected metals.

Metal Work Function (eV)

Na 2.28 Co 3.90 Pb 4.14 Ag 4.73 Pt 6.35

5

• Determine the values, with units, of the x-intercept and the y-intercept. Identify the significance of each of the intercepts. Use your results to identify the metal. Justify your answer. (3 marks)

(Title)

(y –

a xi

s)

(x – axis)

 

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High school Grade 12 physics question was first posted on March 14, 2020 at 9:02 pm.
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