(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

"facing the rising sun of our new day begun

let us march on till victory is won.",

because the rising sun is a symbol of hope.

a is correct

mark me brainliest

hope this

~courtney

active voice: my father cut the tree.

passive voice: the tree was cut by my father.

active voice: people buy newspapers every day.

passive voice: newspapers are bought (by people) every day.

active voice: people have been using movies as political propaganda since world war ii.

passive voice: movies have been used as political propaganda since world war ii.

active voice: donna gave me my birthday present.

passive voice: i was given my birthday present (by donna). / my birthday present was given to me (by donna).

active voice: mom will leave the keys on the counter.

passive voice: the keys will be left (by mom) on the counter.

the words in parentheses are the agent of the passive voice and can be omitted when obvious, generic, or simply unnecessary.

nobody can deny that cars are the most used means of transport all over the world. however owing a car could have some disadvantages. first of all, having a car on your own allows you to go everywhere without depending on timetables. moreover, you can use it whenever you need it no matter the time or the climate conditions. furthermore, if you have a car, you would not have to wait for nobody to share it when going to somewhere. nevertheless, one major disadvantages of owing a car is the fact that fuel is very expensive nowadays so that not everyone can afford it. in addition, you have to pay insurance to be protected by legal conditions. apart from this, the person who owns a car always has to maintain the car and repair any mechanical problem which could costs a huge amount of money. what is more, if you have to travel long distances, and you do not like driving, one probably would be exhausted and irritated due to driving for a long time. besides, cars cause environmental pollution. to sum up, owing a car means that you have more freedom to travel whenever and wherever people want to, however the car maintenance could be a very expensive issue that can have bad consequences at your economy.