# AS Physics OCR Revision

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## 1. What is the Ultraviolet Catastrophe?

• The diffraction pattern caused by shining an ultraviolet light at a double slit
• The graph showing the wavelengths of the blackbody diagrams that showed unexpected bell-shaped curves instead of an infinite negative correlation
• The process of electrons being knocked off and causing an electric current to flow when an ultraviolet light is shined on the surface of a conductive, negatively charged metal
• The ionising nature of ultraviolet light that can cause harm to humans
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## 2. What are the four SUVAT equations?

• S=2V, V=U+2S-A, 2T=-U+V^2, S=T(2U+V)
• v^2=U^2+2AS, S=UT+1/2AT^2, v=U+AT, S= 1/2(U+V)T
• 2V=2U+2AS, S=T+(2AT)^2, V=U-AT, S="(UV)+T

## 3. What pattern does an electron form when aimed at a double slit?

• Two diffraction patterns overlapping
• A diffraction pattern when unobserved, and two slits when observed
• One slit
• No pattern forms

• 6.02x10^26
• 6.626x10^34
• 1.19x10^-19
• 6.634x10^-34

• V=IR
• I=P/V
• R=P/V
• I=VR