You are Here: Home >< Physics

# Question about de Broglie wavelength [EDEXCEL][Unit 4] Watch

1. Can someone explain why the answer to this question is C ?

and what should I understand from the given value 1×10–33 m ?

edit/
I Can't rep Stonebridge at the moment. (teachercol repped btw) Seems like I have done that too many times during the past days/weeks haha :P
2. Te smaller the wavelength the harder it is to show wave properties. There isnt anything that small to act as a diffraction grating.
3. A tennis ball does not diffract through a narrow slit. This is common sense. Quantum and modern physics may have some odd ideas but a tennis ball still behaves like a tennis ball!
It behaves like a typical Newtonian "particle" with mass, momentum, kinetic energy and all the other things you have done in mechanics.
It cannot travel at the speed of light.
It doesn't behave like a wave. Why.

To display wave properties you need to perform an experiment that can show diffraction or interference. This is impossible for the tennis ball given its suggested "wavelength" and other characteristics. How could you do this?
Hence, the ball doesn't display wave properties.
4. Because the ball itself is so much bigger than its wave length it would be impossible for it to act as a wave because when any gap big enough for the ball to fit through would be of no where near the magnitude of the balls wave length.
5. I do not understand the solutions to question 2 and 5 of the same paper here.
For question 2, I thought the solution should be D but it is C. For question 5 the solution is D, I've no idea why.
6. (Original post by farhanyen)
I do not understand the solutions to question 2 and 5 of the same paper here.
For question 2, I thought the solution should be D but it is C. For question 5 the solution is D, I've no idea why.
For 2 I think it's because the shape suggests 0 momentum overall? I'm not sure about 5 either.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: June 12, 2012
Today on TSR

Can it be done?

### Give feedback to Cambridge here

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE