info@qrpastpapers.com +20 106 606 6272

qr past papers logo brand

  • Home
  • Products
  • Free Past Papers
  • more
    • Plans
    • About
    • Our Team
    • Contact Us
    • How It Works
    • Our Services
    • Why Us?
    • Login
    • Sign Up
    • Cart and payment
Edexcel | Physics WPH0 | W 11 5 1 | 1 hour 30 minutes
QP PDF
Manage Classified
MS PDF
  • Q1
  • Q2
  • . . . .
  • Q3
  • Q4
  • Q5
  • Q6
  • Q7
  • Q8
  • Q9
  • Q10
  • Q11
  • Q12
  • Q13
  • Q14
  • Q15
  • Q16
  • Q17
  • Q18
16
Add To Classified

Observing the display of a ‘floating image’ clock relies on the phenomenon of

‘persistence of vision’. The clock has a wand with a set of flashing light-emitting diodes

(LEDs) at its end. The wand oscillates rapidly back and forth and takes only 0.0625 s tosweep from one end to the other. The wand becomes almost invisible to the eye, while the flashing LEDs create a floating image effect.

                                             

16
(a)
Add To Classified

The tip of the wand moves with simple harmonic motion as it sweeps through a

distance of 10.0 cm from one end to the other.

16
(a) (I)
Add To Classified
2 Mark s

Calculate the frequency of the wand’s oscillation.

 

                                       Frequency = . . . . . . . . . . . . . . .

16
(a) (II)
Add To Classified
1 Mark

The speed of the wand varies as it sweeps back and forth. At what point will

the speed of the wand be a maximum?

At the equilibrium (position) / centre of the oscillation / mid-point

16
(a) (III)
Add To Classified
2 Mark s

Calculate the maximum speed of the tip of the wand.

                                Maximum speed = . . . . . . . . . . . . . . . . . . . .

16
(b)
Add To Classified

In normal operation the clock may make a faint ticking or humming sound. An

unstable surface supporting the clock can result in noisy operation due to resonance.

 

16
(b) (I)
Add To Classified
2 Mark s

Explain what is meant by resonance.

Idea that the system is forced / driven into oscillation at / near its natural

frequency

OR driver / forcing frequency is equal / near to natural frequency (1)

Leads to large/max energy transfer OR large/max/increasing amplitude

16
(b) (II)
Add To Classified
2 Mark s

The clock is mounted on rubber feet so that it does not make direct contact with

surfaces. Explain how this helps to reduce the effects of resonance.

Max 2

♦ Rubber feet (deform and) absorb (vibration) energy 

♦ Reference to damping 

♦ Idea that energy is removed from system 

♦ Hence amplitude does not build up

  • Q1
  • Q2
  • . . . .
  • Q3
  • Q4
  • Q5
  • Q6
  • Q7
  • Q8
  • Q9
  • Q10
  • Q11
  • Q12
  • Q13
  • Q14
  • Q15
  • Q16
  • Q17
  • Q18

QR Past Papers.

Email:info@qrpastpapers.com
Phone: +2 0106 606 6272

  • Home
  • Legal Information
  • Terms And Conditions
  • Return & Refund Policy
  • Privacy policy
  • Login
  • Register
  • Shop
  • About us
  • Contact US
  • Services

Our Social Networks

Follow us

© Copyright 2021, QR PAST PAPERS. All Rights Reserved.
All the included past papers are copyrighted © University of Cambridge Local Examinations Syndicate (UCLES), which we have collected from various online sources and gathered together in one website.