sound frequencies below 16 hertz are usually referred to by scientists as:

512

---

What is an electron?

542

---

heat cannot pass from a cooler substance to a warmer substance without some other process being involved. This is an example of which law of thermodynamics?

528

---

While at berkeley, melvin calvin used this radioisotope to decipher many of the complex processes of photosynthesis:

494

---

Which is heavier the land mass or the sea?

542

---

Laser is an acronym for what?

543

---

On an electric schematic, what does the symbol of a horizontal line interrupted by a saw tooth shaped line represent?

509

---

the department of energys b-factory at the stanford linear accelerator lab is designed to collide electron and positron beams of unequal energies and producemillions of these particles, which are commonly called?

515

---

What is the difference between diffraction and interference?

490

---

What are the characteristics of dead stars?

498

---

When is fluorescence strong?

496

---

According to coulombs law, if two charged particles are repelled with a given force at a distance d, by what multiple will the force decrease by if d is increased by 4times?

504

---

If blue light is combined with green light, what color of light is produced?

521

---

what law yields an equation that is used in determining crystal structure from interference patterns produced by monochromatic x-rays?

516

---

What is balanced field takeoff?

541

---