(a) Compute the speed of sound waves in air at room temperature (T=20°C) and find the range of .wavelengths in air to which the human ear (which can hear frequencies in the range of 20 –
20,000Hz) is sensitive. The mean molar mass of air (a mixture of principally nitrogen and
oxygen) is 28.8 x 10-kg/mol and the ratio of heat capacity is Y = 1.40.
(b) If the Lead City F. M station broadcasts at a 107.5 MHz with a radiated power of 65.0kW
i.
i.
What is the magnitude of the moment of each photon?
How many photons does Lead City F. M station emit each second?
(C) Define the term blackbody? State Wien's displacement law.
The surface of the sun has a temperature of about 5800K. To a good approximation we may treat
it as a blackbody

Writers try to let us know what is central to their writing. when we notice words such as "meanwhile," "afterward," "before," or "previously," an author is letting us know the order in which events happen. a paragraph that mostly uses these key words is arranged in what structural form?

Mangrove have two types of specialized root systems t f

Match the definition to the word for a better understanding of the paragraph. 1 money does not buy happiness or security. 2john ringling, one of the five brothers of the ringling brothers circus, started out in 1884 with a trained horse and a performing bear. 3for over forty years, he worked hard at the family enterprise, bought up smaller circuses, and imported new acts. 4in the 1920s, he was rated as one of the world's wealthiest men and owned every sizable circus in the country. 5over 5,000 people were on his payroll, and over 240 railroad cars were in his retinue each time the circus moved. 6at the time of his death, however, he was a nervous, unhappy man; he was also bankrupt and beset by lawsuits. 7his carefully built circus empire passed into alien hands. 8all those years of work had turned to dust. 1. business organization alien 2. group beset 3. without funds to pay debts retinue 4. troubled or harassed enterprise 5. strange; belonging to another person, place, country, or thing bankrupt