Waves on a String: A wave whose wavelength is 0.500 m is traveling down a 500-m long wire whose total mass is 25 kg and is under a tension of 2000 N.(a) What is the speed of the wave on the wire?(b) Find the frequency of this wave.
What will be an ideal response?
(a) 200 m/s (b) 400 Hz
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The symbol for the element with the highest electronegativity is ______________
Indicate whether the statement is true or false
What was the temperature of the universe when the recombination took place that produced the cosmic background radiation we observe today?
a. about 2.7 K b. about 300 K c. about 3000 K d. about 3 million K e. about 3 billion K
The utilities always follow the practice of retiring fossil fuel electric generating plants at the end of their original lifetimes
What will be an ideal response?
Radio maps of the spiral arms of our galaxy Group of
a.They map the location of dense neutral hydrogen clouds b.They map the location of hot O and B stars by the radio radiation they emit c.They reveal that the Sun is currently located in the centre of a spiral arm d.They reveal that our galaxy is a grand design spiral