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Chap. 24 Conceptual Modules Giancoli

Chap. 24 Conceptual Modules Giancoli

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ConcepTest <strong>24</strong>.3b Double Slits II<br />

If instead the slits are moved<br />

farther apart (without changing<br />

the wavelength) the interference<br />

pattern<br />

1) spreads out<br />

2) stays the same<br />

3) shrinks together<br />

4) disappears<br />

d sin θ<br />

λ<br />

= m<br />

If instead d is increased and<br />

λ does not change, then θ<br />

must decrease, so the<br />

pattern shrinks together<br />

Follow-up: When would the interference pattern disappear?

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