This image shows the screen of an oscilloscope. The time-base of the oscilloscope is set at 500 μ s , div - 1 Calculate the time period of the signal and hence its frequency.

Given, time-base of the oscilloscope is set at 500 μs div - 1 We know that two waves occupy 4 . 8 div - 1 So one wave = 4 . 8 2 = 2 . 4 div - 1 ∴ Time for 2 . 4 Division = 2 . 4 × 500 μs = 1200 μs div - 1 ∴ frequency f = 1 period = 1 1200 × 10 - 6 = 833 Hz ≈ 830 Hz So, the time period of the signal is 1200 μs And its frequency. ≈ 830 Hz

E M B I B E

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>Questions>Q 17

EASY

AS and A Level

IMPORTANT

Earn 100

Plane polarised light is incident at a Polaroid. Calculate the angle $θ$ , which gives transmitted light of intensity $30 %$ that of the incident intensity of light.

Important Questions on Waves

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>REFLECTION

Can you think of any applications of Malus's law?

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>REFLECTION

Make a list of some key words in this chapter. Ask a classmate to make a similar list. Now compare your lists. How good was your list? Did you miss out anything important? What things might you want more help with?

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>EXAM-STYLE QUESTIONS>Q 1

What is the correct unit for intensity ?

EASY

AS and A Level

IMPORTANT

Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 12 - Waves>EXAM-STYLE QUESTIONS>Q 2

This image shows the screen of an oscilloscope. The time-base of the oscilloscope is set at $500 μ s$ , ${div}^{- 1}$

Question Image