Producing larger-diameter telescopes (AQA A-Level Physics): Quizzes

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Producing larger-diameter telescopes
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What formula gives minimum angular resolution θ\theta for a telescope with diameter DD?

θ≈λD\theta \approx \frac{\lambda}{D}

What happens to minimum angular resolution if telescope diameter is doubled?

It is halved

Why do radio telescopes need much larger diameters than optical telescopes?

They observe longer wavelengths

What limits single-piece telescope mirrors to a few metres diameter?

Gravitational deformation under own mass

What are actuators in segmented mirror telescopes?

Devices that produce mechanical movement

What is the effective aperture diameter of Gran Telescopio Canarias?

10.4 m

What is the baseline LL in a radio interferometer?

Separation distance between antennas

What formula gives angular resolution for a radio interferometer with baseline LL?

θ≈λL\theta \approx \frac{\lambda}{L}

What does VLBI stand for and what does it provide?

Very large baseline interferometry

If λ=0.2\lambda = 0.2 m and θ=2×10−3\theta = 2 \times 10^{-3} rad, what diameter DD is needed?

100 m

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