sound wave of frequency 640 Hz travels 8oom in 2.5 s. calculate: (a) speed of sound (b) wavelength of sound wave

If element X has 90 protons, how many electrons does it have?

At a temperature of 250 K, the gas in a cylinder has a volume of 20 L. If the temperature increased to 260 K, what must the volume be for the gas pressure to remain constant? a. 10 L b. 20.8 L c. 200 L d. 384.6 L

What changes in the 1970s and 1980s made cars more energy efficient?

Which colour of light is reflected more by a prism, green or blue? Why?

How far away from the sun would a planet mercury's size have to be before it would have an atmosphere?

What happens to the resistance of a filament if it is replaced by a shorter wire?

One group of scientists feel that global warming affects the frequency of hurricanes. Another group of scientists believe that global warming does not affect the frequency of hurricanes, but it makes the average hurricane stronger.

In an experiment, all participants receive a treatment but those in the control group recieves a false treatments

When the volume increased, what happened to the density?

8. Chemical weathering occurs more rapidly in what kind of climates? A. Desertlike B. Cold with high snowfall amounts C. Cool and dry D. Warm with abundant rainfall