When a star or galaxy is moving away from us it's light appears ___.

• Red shifted

• Blue shifted

• White

Light appears to blue shift when the wavelength gets _____

• longer

• shorter

When atoms fuse the nucleus gets ___.

• larger

• smaller

The number of ____ determines the element.

• protons

• neutrons

• electrons

The element used in the fusion process of a main sequence star like our sun is ____.

• hydrogen

• helium

• carbon

• iron

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

Elements heavier than iron form in a ___.

• low mass star

• supernova

• giant

• supergiant

Answer explanation

The shockwave effect from the collapsing high mass star allows for enough force to cause fusion. Think head on collision of 2 cars vs one car running into a stationary object.

Tags

NGSS.HS-ESS1-3

True or False: Iron will form in a low mass star.

• True

• False

Tags

NGSS.HS-ESS1-3

In order for elements to form, the universe had to ____.

• expand and cool

• expand and warm up

• contract and cool

• contract and warm up

Answer explanation

The initial temperature of the Universe was so high that no matter existed. The universe had to expand and cool to allow the energy to slow down and materialize.

Tags

NGSS.HS-ESS1-2

Fusion in stars occurs when the mass ___

• contracts and cools

• contracts and warms up

• expands and cools

• expands and warms up

Answer explanation

In the core of a star the pressure from gravity causes the core to contract, the temperature to rise, and the speed of the particles to increase.

Tags

NGSS.HS-ESS1-1

When a proton and a Hydrogen-2 atom fuse, _____ is made.

• Hydrogen-3

• Helium-3

• Helium-4

• Hydrogen-2

Answer explanation

Hydrogen-2 is a proton and a neutron. When it fuses with a proton (Hydrogen), there are 2 protons and 1 neutron. An element with 2 protons is Helium. Because there are 3 particles in the nucleus, the atom is Helium-3

Tags

NGSS.HS-PS1-8