Flashcards
Physics
Flashcards do conjunto (20)
- 1What is the equation for Kinetic Energy?
- 2What is the equation for Gravitational Potential Energy?ΔGPE=mgΔh
=mass (kg) x gravitational field strength (N/kg) x height (m) - 3What is the equation for work done?Work done (Nm) =Force (N) × distance (m)
- 4What is the equation for electrical work done?
- 5What is the equation for Power?Power (Watts) = Energy (J)
________________
time (s) - 6What is the equation for efficiency of energy transfer
- 7What is the equation for Wave Speed (m/s)Frequency x Wavelength
(Hz) (m) - 8Some atomic nuclei are unstable. The nucleus gives out radiation as it changes to become more stable. This is a random process called ____________________?Radioactive Decay
- 9Radioactivity: "Activity" is defined as...The rate at which a source of unstable nuclei decays.
- 10Radioactivity: Activity is measured in __________Becquerel (Bq)
- 11Radioactivity: "Count-rate" is defined as...The number of decays recorded each second by a detector
(eg Geiger-Muller tube) - 12An alpha particle (α) consists of...2 neutrons & 2 protons
(same as a helium nucleus) - 13A beta particle (β) is...A high speed electron ejected from the nucleus as a neutron turns into a proton
- 14A gamma ray (γ) is...Electromagnetic radiation from the nucleus
- 15The nuclear radiation emitted may be:• an alpha particle (α)
• a beta particle (β)
• a gamma ray (γ)
• a neutron (n) - 16How has model of atom changed?1. Plum pudding model
2 Nuclear model
3. Niels Bohr (electrons orbit at specific distances)
4. Positive charge of nucleus divided into protons
5. James Chadwick - existence of neutrons - 17Describe the "plum pudding model"Atom being a ball of positive charge
with negative electrons embedded in it - 18What experiment led to "The Nuclear Model"? Describe the nuclear model1) Alpha particle scattering
2) a) The mass of an atom is in the nucleus
b) the nucleus is charged - 19How did Niels Bohr adapt the nuclear model?Electrons orbit nucleus at specific distances.
Later idea...positive charge of nucleus subdivided into smaller particles, each with same amount of positive charge.
Named "protons". - 20James Chadwick provided evidence for...?Showed the existence of neutrons within nucleus
(...20 years after the nucleus became an accepted scientific idea)
Informações
- Descrição
- Year 11 Physics FlashCards sobre Physics, criado por Matthew Bradley em 12-03-2018.
- Criado por
- Matthew Bradley
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