2. Observational Methods

Detectors — Quiz

Test your understanding of detectors with 5 practice questions.

Practice Questions

Question 1

Which type of noise in astronomical detectors is primarily caused by the statistical fluctuations in the number of charge carriers generated by thermal energy, even in the absence of light?

Question 2

When comparing CCDs and CMOS detectors, which of the following statements accurately describes a key difference in their readout mechanisms?

Question 3

A bolometer detects electromagnetic radiation by measuring the change in which physical property upon absorption of photons?

Question 4

In the context of radio astronomy, what is the primary advantage of using an interferometer, which combines signals from multiple radio receivers?

Question 5

Consider a CCD detector with a quantum efficiency of $70\%$ at a specific wavelength. If $1000$ photons of that wavelength strike the detector, how many electrons are expected to be generated?