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5. (Waves)
A diffraction grating has 500 lines/mm. Monochromatic light of wavelength 540 nm is incident normally.
a) Calculate the grating spacing in metres.
b) Find the angle of the second-order maximum.
c) Explain why higher orders may not be observed. past papers a level physics free
(10 marks)
6. (Circular Motion & Gravity)
A satellite orbits Earth at a height of 400 km above the surface.
(Earth’s radius ( R = 6.37 \times 10^6 , \textm ), Earth’s mass ( M = 5.97 \times 10^24 , \textkg ), ( G = 6.67 \times 10^-11 , \textNm^2/\textkg^2 ))
a) Calculate the orbital radius.
b) Derive an expression for orbital speed in terms of ( G ), ( M ), and ( r ).
c) Find the orbital period in minutes. The most reliable and legal way to get
(12 marks)
7. (Electric Fields)
Two parallel plates are separated by 2.0 cm with a potential difference of 500 V.
a) Calculate the electric field strength between the plates.
b) An electron is released from rest at the negative plate. Find its speed just before hitting the positive plate. (e = ( 1.60 \times 10^-19 , \textC ), ( m_e = 9.11 \times 10^-31 , \textkg ))
c) Sketch the electric field lines between the plates. Here is a realistic 6-week plan using only free resources:
(8 marks)
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