Free Printable Astronomy Quiz for A2

1.

A hydrogen line has a wavelength of 486 nm in the lab, but 501 nm from a distant galaxy. What is the change in wavelength?

a)

13 nm

b)

18 nm

c)

20 nm

d)

15 nm

2.

According to Wien’s displacement law, $\lambda_{\text{max}}$ is inversely proportional to:

a)

Surface temperature

b)

Radius of the star

c)

Luminosity

d)

Temperature

3.

Calculate the frequency of the line observed at 501 nm.

a)

$6.17\times10^{14},\text{Hz}$

b)

$5.99\times10^{14},\text{Hz}$

c)

$5.99\times10^{13},\text{Hz}$

d)

$5.99\times10^{14},\text{Hz}$

4.

Calculate the radius of a star with a luminosity of $3.7\times10^{26}\ W$ and surface temperature of 5250 K.

a)

$2.5\times10^8,\text{m}$

b)

$6.0\times10^8,\text{m}$

c)

$8.25\times10^8,\text{m}$

d)

$4.5\times10^8,\text{m}$

5.

For a star with a peak wavelength of 480 nm and luminosity $4.35\times10^{26},\text{W}$ , what is its radius?

a)

$1.5\times10^8,\text{m}$

b)

$2.16\times10^8,\text{m}$

c)

$3.0\times10^8,\text{m}$

d)

$4.35\times10^8,\text{m}$

6.

How do emission lines of hydrogen differ when observed from distant galaxies?

a)

The lines appear at the same wavelength

b)

The lines have a shorter wavelength

c)

The lines have a longer wavelength

d)

The lines disappear completely

7.

Hubble's law implies that as galaxies move away from us, their recession speeds will:

a)

Decrease over time

b)

Remain constant

c)

Increase with distance

d)

Decrease with distance

8.

Hubble's law states that the speed of recession of a galaxy is proportional to its:

a)

Distance

b)

Mass

c)

Luminosity

d)

Temperature

9.

If the radiant flux intensity at distance D is $7.2\times10^6,\text{W m}^{-2}$ , what will it be at a distance of 2D?

a)

$3.6\times10^6,\text{W m}^{-2}$

b)

$1.8\times10^6,\text{W m}^{-2}$

c)

$5.4\times10^6,\text{W m}^{-2}$

d)

$0.9\times10^6,\text{W m}^{-2}$

10.

The inverse square law for radiant flux density is given by which equation?

a)

$F=\frac{L}{2\pi d^2}$

b)

$F=\frac{L}{4\pi r^2}$

c)

$F=\frac{L}{2\pi r^2}$

d)

$F=\frac{L}{4\pi d^2}$

11.

Using Hubble’s law, calculate the distance to a galaxy with a recession speed of $9.26\times10^6,\text{m/s}$ and a Hubble constant of $2.27\times10^{-18},\text{s}^{-1}$ .

a)

$3.5\times10^{24},\text{m}$

b)

$4.08\times10^{24},\text{m}$

c)

$5.0\times10^{24},\text{m}$

d)

$6.0\times10^{24},\text{m}$

12.

What does redshift provide evidence for?

a)

The rotation of galaxies

b)

The gravitational pull of stars

c)

The expansion of the universe

d)

The formation of black holes

13.

What is a "Standard Candle" in astronomy?

a)

A type of variable star

b)

An object with an unknown luminosity

c)

An object of known luminosity used to estimate distance

d)

A candle used for alignment in telescopes

14.

What is the definition of redshift in astronomy?

a)

Shift toward longer wavelengths due to star formation

b)

Shift toward longer wavelengths due to the motion of galaxies away from the observer

c)

Shift toward shorter wavelengths due to cosmic expansion

d)

Shift toward shorter wavelengths due to light absorption

15.

What is the peak wavelength $\lambda_{\text{max}}$ of a star with a surface temperature of 5000 K?

a)

$576\times10^{-9},\text{m}$

b)

$500\times10^{-9},\text{m}$

c)

$620\times10^{-9},\text{m}$

d)

$700\times10^{-9},\text{m}$

16.

What is the Stefan-Boltzmann law?

a)

$L=4\pi\sigma r^2T^2$

b)

$L=4\pi\sigma r^2T^3$

c)

$L=4\pi\sigma r^2T^4$

d)

$L=4\pi\sigma r^2T^5$

17.

What is the temperature of a star with a peak wavelength of 437 nm?

a)

6500 K

b)

4000 K

c)

6590 K

d)

4800 K

18.

What is the unit of the Stefan-Boltzmann constant $\sigma$ ?

a)

$\text{W m}^{-2}\text{K}^{-4}$

b)

$\text{J m}^{-2}\text{K}^{-1}$

c)

$\text{N m}^{-2}\text{K}^{-2}$

d)

$\text{Pa m}^{-2}\text{K}^{-3}$

19.

Which of the following is a key prediction of the Big Bang theory?

a)

The universe is static and unchanging

b)

The universe has always existed

c)

The universe began at a single point and expanded

d)

The universe will eventually collapse

20.

Which of the following is the definition of Luminosity ($L$) for a star?

a)

Power per unit area at a point

b)

Total power of radiation emitted by a star

c)

Intensity of radiation received by a telescope

d)

The surface temperature of the star

Astronomy Quiz for A2

Total questions: 20

Worksheet time: 20mins

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