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Flashcards 2022-02-07 What are the two types of beta decay?? Beta minus Beta plus How should you write an electron in a beta decay equation?? $$ _{-1}^0 e $$ When denoting particles in a beta decay equation, such as $_y^x \alpha$, what does $y$ represent?? The charge. When denoting particles in a beta decay equation, such as $_y^x \alpha$, what does $x$ represent?? The nucleon number. What two quantities are conserved in a beta decay equation?

See Also [[Physics - Waves]]S Flashcards When is a standing wave formed?? When two waves with the same frequency and amplitude travelling in opposite directions are superimposed. What are the points of total constructive interference in a standing wave called?? Antinodes. What are the points of total destructive interference in a standing wave called?? Nodes. What is the seperation between adjacent nodes or antinodes in a standing wave?? $$ \frac{\lambda}{2} $$

See Also [[Physics - Quantum Physics]]S [[Physics - The Photoelectric Effect]]S Flashcards What’s the evidence that light exists as a particle?? The photoelectric effect. What’s the evidence that light exists as a wave?? They form diffraction patterns. What’s the evidence that electrons exist as a wave?? They form diffraction patterns. What would you expect when firing electrons through two slits if they are a particle?? There should be two bright spots and no inteference pattern.

See Also [[Physics - Waves]]S [[Physics - Standing Waves]]S Flashcards At what phase differences does total constructive superposition occur?? $$ 0, 2\pi, 4\pi, 6\pi, 8\pi, … $$ At what phase differences does total destructive superposition occur?? $$ \pi, 3\pi, 5\pi, 7\pi, 9\pi $$ What requirement other than phase difference is there for total destructive superposition?? Both waves need to have the same amplitude. 2021-05-27 What does it mean for two wave sources to be coherent?

See Also [[Physics - Quantum Physics]]S [[Physics - Electromagnetic Radiation]]S Flashcards What is the photoelectric effect?? The release of an electron when a photon is incident on a metal surface. When does the photoelectric effect occur?? When the photons incident on a material have a frequence above a threshold frequence $f_0$. Why was the discovery of the photoelectric effect significant?? It showed that light was a particle as well as a wave.

See Also [[Physics - Quantum Physics]]S [[Physics - The Photoelectric Effect]]S Flashcards What is the equation for the energy of a photon in terms of frequency?? $$ E = hf $$ What is the equation for the energy of a photon in terms of wavelength?? $$ E = \frac{hc}{\lambda} $$ What is the approximate value of $h$, Plank’s constant?? $$ 6.63 \times 10^{-34} $$ What unit is commonly used for the energy on a photon?

See Also [[Physics - Electromagnetic Radiation]]S [[Physics - The Photoelectric Effect]]S Flashcards Why is it called “quantum” physics?? Because energy exists in “quanta” or “packets”. Backlinks [[Physics - Electromagnetic Radiation]]S [[Physics - The Photoelectric Effect]]S [[Physics - Syllabus]]S [[Physics - Wave-Particle Duality]]S Metadata date: 2021-05-24 15:36 tags: - '@?school' - '@?public' - '@?physics' - '@?quantum' - '@?year-1' title: Physics - Quantum Physics

See Also [[Physics - Internal Resistance]]S [[Physics - Voltage and Potential Difference]]S Flashcards If the resistance of $R_1$ is twice that of $R_2$, how much more of the total potential difference does $R_1$ get?? Twice as much. What is the potential divider equation?? $$ V_{\text{out}} = V_{\text{in}} \times \frac{R_1}{R_1 + R_2} $$ Backlinks [[Physics - Syllabus]]S Metadata date: 2021-05-05 15:53 tags: - '@?physics' - '@?

See Also [[Physics - Resistance and Ohm's Law]]S [[Physics - Voltage and Potential Difference]]S Flashcards If $E$ is the E.M.F. of a battery and $V$ is the terminal voltage, what is the formula for “lost volts”?? $$ Ir = E - IR $$ Why are there “lost volts” in a battery?? Because the battery has some internal resistance. Why do the lights on old-fashioned cars blink out when you start the engine?

Flashcards What is a loading and unloading curve?? A graph that shows how extension varies with force as a material is being stretched and released. Why is there a difference between the loading and unloading curves for an elastic band?? More work is done stretching (loading) the elastic band than releasing (unloading) it. What is the loop formed between the unloading and loading curves called?? A hysteresis loop. What is tensile stress?? The force applied per unit cross-sectional area of a material.

See Also Flashcards What has the longest wavelength on the electromagnetic spectrum?? Radio waves What has the shortest wavelength on the electromagnetic spectrum?? Gamma rays What is the range of wavelengths for visible light?? $$ 380nm \text{to} 740nm $$ What is the speed of an electromagnetic wave in a vacuum?? $$ 3 \times 10^8 m/s $$ What do electromagnetic waves consist of?? Oscillating magnetic and electrical vibrations at right angles to one another. 2021-03-30 What is roughly the wavelength of radio waves?

See Also [[Physics - Waves]]S [[Physics - Diffraction]]S [[Physics - Polarisation]]S [[Physics - Reflection and Refraction]]S Flashcards What is the intensity of a wave?? The radiant power passing through a surface per unit area. What is the SIMPLE formula for intensity?? $$ I = \frac{P}{A} $$ What is the formula for intensity?? $$ I = \frac{P}{4\pi r^2} $$ Why does the intensity of a wave decrease as you move further away?