A sound wave will rebound when it encounters what?

Physics

2 answers:

Over [174]3 years ago

8 0

The sound wave will rebound when it is a barrier, hope this helps

goblinko [34]3 years ago

8 0

Answer: A barrier

Explanation: A sound wave requires medium to travel. It travels in air. Frequency is the number of cycles per second of a wave. A light is an electromagnetic wave which can travel through vacuum as well as medium. A sound rebounds when it encounters a barrier i.e. when it does not carry enough energy to travel through it.

Hence, the correct answer is a barrier.

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Alex787 [66]

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3 years ago

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The table below describes some features of methods used to generate electricity. What is method 3?

blondinia [14]

Answer:

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2 years ago

16x^2y^2-25a^2b^2<br>factorize the expression

SIZIF [17.4K]

Answer:

(4xy+5ab)(4xy-5ab)

Explanation:

16 $x^{2}$ $y^{2}$ -25 $a^{2}$ $b^{2}$

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So, this factorized is:

(4xy+5ab)(4xy-5ab)

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3 years ago

f your risk-aversion coefficient is A = 4 and you believe that the entire 1926–2015 period is representative of future expected

siniylev [52]

Answer:

The portfolio should invest 48.94% in equity while 51.05% in the T-bills.

Explanation:

As the complete question is not given here ,the table of data is missing which is as attached herewith.

From the maximized equation of the utility function it is evident that

$Weight=\frac{E_M-r_f}{A\sigma_M^2}$

For the equity, here as

$Weight$ is percentage of the equity which is to be calculated
${E_M-r_f}$ is the Risk premium whose value as seen from the attached data for the period 1926-2015 is 8.30%
$A$ is the risk aversion factor which is given as 4.
$\sigma_M$ is the standard deviation of the portfolio which from the data for the period 1926-2015 is 20.59