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Quiz

P7 Quiz - Stars

Leah Firmstone 14 perguntas Atualizado em 24 jun 2016

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Perguntas do quiz (14)

  1. 1All hot objects, including stars, emit a continuous range of radiation in the electromagnetic spectrum.
    1. AVerdadeiro
    2. BFalso
  2. 2When atoms in a pure element are [blank_start]excited[blank_end] (given lots of energy) they give off light at fixed and [blank_start]characteristic[blank_end] frequencies. These frequencies directly relate to the colour - from low frequency [blank_start]infrared[blank_end], through the visible spectrum, and up to high frequency [blank_start]ultraviolet[blank_end].

    These emission line spectra are like a chemical [blank_start]fingerprint[blank_end] for that element. They are caused by the movement of electrons between energy [blank_start]levels[blank_end] in the atoms. Hydrogen has the [blank_start]simplest[blank_end] emission spectrum.

    A [blank_start]star[blank_end] will give off energy at a range of [blank_start]frequencies[blank_end], but there will be some gaps in it. The gaps in the spectrum from the Sun correspond exactly to the lines in the emission [blank_start]spectrum[blank_end] for hydrogen. This means that there is hydrogen present in the Sun, which is [blank_start]absorbing[blank_end] light of specific frequencies.
    1. Aexcited
    2. Bcharacteristic
    3. Cinfrared
    4. Dultraviolet
    5. Efingerprint
    6. Flevels
    7. Gfrequencies
    8. Hspectrum
    9. Iabsorbing
    10. Jsimplest
    11. Kstar
  3. 3There are several energy level transitions that are possible within one type of atom - so an element absorbs and emits energy at a range of characteristic frequencies.
    1. AVerdadeiro
    2. BFalso
  4. 4Boyle's Law states that [blank_start]pressure[blank_end] is inversely proportional to volume. The pressure of a gas is caused by the [blank_start]particles[blank_end] colliding with the sides of the container, exerting a [blank_start]force[blank_end] per unit of area. The pressure depends on the [blank_start]frequency[blank_end] of collisions and the force of the particles’ momentum (which is [blank_start]constant[blank_end] as the gas is kept at a constant temperature). If the volume of the container [blank_start]halves[blank_end], there is half the amount of space for particles to move around in, making [blank_start]collisions[blank_end] more likely. As the number of collisions [blank_start]increases[blank_end], so does the pressure.
    1. Apressure
    2. Bparticles
    3. Cforce
    4. Dfrequency
    5. Econstant
    6. Fhalves
    7. Gcollisions
    8. Hincreases
  5. 5The Pressure Law states that...
    1. A...at a fixed temperature the volume of a gas is inversely proportional to the pressure exerted by the gas.
    2. B...if the temperature of a gas with a constant volume is measured on the kelvin scale, we find that the pressure is proportional to the temperature.
    3. C...for a fixed mass of gas at a constant pressure, its volume is proportional to its pressure.
  6. 6What is absolute zero?
    1. AThe lowest point on Earth.
    2. BThe coldest temperature possible, when all particles in any substance stop moving completely.
    3. CThe lowest pressure a substance can exert.
  7. 7How many Kelvin would water boil at?
    1. A373K
    2. B100K
    3. C-173K
  8. 8Charles' Law is defined as which of the following?
    1. AThat for a fixed mass of gas at a constant pressure, its volume is proportional to the temperature.
    2. BThat when the number of particles in a gas is increased, it becomes less volatile.
    3. CThat the volume of a gas would always decrease when its temperature is increased.
  9. 9A star begins its life as a [blank_start]cloud[blank_end] of gas, which is mostly [blank_start]hydrogen[blank_end] and helium. The particles experience a very weak attraction towards each other due to [blank_start]gravity[blank_end].

    As the gas cloud becomes [blank_start]denser[blank_end], the effect of gravity is to increase the [blank_start]pressure[blank_end] and temperature. As more gas is drawn in by the increasing gravity, the mass of the cloud [blank_start]increases[blank_end] and therefore so does its gravity.

    The increasing gravity [blank_start]compresses[blank_end] the gas further so that it becomes hotter and denser. It eventually becomes a [blank_start]proto[blank_end]star.

    When the temperature and pressure become high enough, the hydrogen nuclei [blank_start]fuse[blank_end] into helium nuclei, releasing large amounts of [blank_start]energy[blank_end]. The star is now a stable [blank_start]main sequence[blank_end] star.
    1. Acloud
    2. Bhydrogen
    3. Cgravity
    4. Ddenser
    5. Epressure
    6. Fincreases
    7. Gcompresses
    8. Hfuse
    9. Ienergy
    10. Jmain sequence
    11. Kproto
  10. 10Isotopes of an element have the same number of protons but a different number of neutrons.
    1. AVerdadeiro
    2. BFalso

Informações

Descrição
GCSE Physics (P7) Quiz sobre P7 Quiz - Stars, criado por Leah Firmstone em 07-04-2016.
Idioma
English
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82
Histórico
Criado em 7 abr 2016 · atualizado em 24 jun 2016
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