Cosmology
Muhtasari
About 14 billion years ago, everything in the universe was compressed into a single, incredibly hot, dense point. Then it exploded outward in an event we call the Big Bang, and it has been expanding ever since. The evidence for this remarkable claim comes from two independent observations: the red-shift of distant galaxies and the faint microwave glow that fills every corner of the sky.
In this lesson you will learn how the Doppler effect stretches light from receding galaxies, how this red-shift reveals that the universe is expanding, and how the cosmic microwave background radiation provides a snapshot of the early universe. You will also use the red-shift equation and explore how astronomers estimate the age of the universe. These ideas are tested on Edexcel Papers 1 and 2, often as explain-the-evidence questions.
Malengo
- Describe the past evolution of the universe and the main arguments in favour of the Big Bang theory
- Describe evidence that supports the Big Bang theory (red-shift and cosmic microwave background radiation)
- Describe that if a wave source is moving relative to an observer, there will be a change in the observed frequency and wavelength
- Use the equation relating to change in wavelength, reference wavelength, velocity of a galaxy and the speed of light: (lambda - lambda0) / lambda0 = v / c
- Describe the red-shift in light received from galaxies at different distances away from the Earth
- Explain why the red-shift of galaxies provides evidence for the expansion of the universe
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Tathmini ya Somo
Hongera kwa kukamilisha somo la Cosmology. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- What does it mean when light from a distant galaxy is red-shifted? A) The galaxy is getting hotter B) The galaxy is moving towards Earth C) The galaxy is moving away from Earth D) The galaxy is slowing down Answer: C
- The cosmic microwave background radiation has a temperature of approximately: A) 0 K B) 2.7 K C) 273 K D) 6000 K Answer: B
- What happens to the red-shift of a galaxy as its distance from Earth increases? A) It decreases B) It stays the same C) It increases D) It changes to blue-shift Answer: C
- Which of the following is NOT evidence for the Big Bang theory? A) Red-shift of galaxies B) Cosmic microwave background radiation C) Stars emitting light D) More distant galaxies receding faster Answer: C
- A spectral line has a reference wavelength of 500 nm. It is observed at 520 nm from a galaxy. The red-shift value (z) is: A) 0.02 B) 0.04 C) 20 D) 0.96 Answer: B
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Cosmology? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
