1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katen-ka-za [31]
3 years ago
8

A sound wave propagates through a region filled with an ideal gas at constant temperature T. It approaches an acoustically perme

able but thermally insulating membrane such that the angle between the wave and the plane of the membrane is 30 degrees. On the other side of the membrane is the same gas at a different temperature T. What is the minimum value of T/T such that no sound passes across the barrier? (You may find it useful to know that the speed of sound in an ideal gas is proportional to VT.) a.1 b.1/2 c.3/4 d.4/3. e.2.

Physics
1 answer:
nataly862011 [7]3 years ago
5 0

Answer:

The answer is <em>e.2</em>

Explanation:

We should make use of Snell's refractive law. The arriving wave has a certain velocity at T in a medium, then instantly it reaches a medium (same composition) at T' where velocity would either decrease or increase.

When the incidence angle is 30 °, and we want to make the refraction angle 90 ° such that no sound passes through the barrier (this would be named total internal refraction), so we want the second medium to be "faster" than in the first.

<em>The steps are in the image attached:</em>

You might be interested in
Which of the following is the best definition of the term pseudopsychology?
blagie [28]
Can you give us the options…?
3 0
3 years ago
1. A sprinter races in the 100 meter dash. It takes him 10 second to reach the finish line
poizon [28]

Answer:

v = 10 m/s

Explanation:

Given that,

Distance covered by a sprinter, d = 100 m

Time taken by him to reach the finish line, t = 10 s

We need to find his average velocity. We know that velocity is equal to the distance covered divided by time taken. So,

v = d/t

v=\dfrac{100\ m}{10\ s}\\\\v=10\ m/s

Hence, his average velocity is 10 m/s.

6 0
3 years ago
Alice suffered a minor electrical shock as she switched on her bathroom light. She is concerned and wants to prevent it from hap
snow_tiger [21]
Get a pull chord light switch installed in her bathroom by a qualified electrician asap. Meanwhile, keep hands as dry as possible, and try not to go near that switch until it's either been properly earthed, or whatever the problem actually is, and get qualified advice on what the problem is. Don't have wet feet either, and don't stand in puddles of water whilst operating - i she has to - the switch. 250V AC mains can be lethal, and at least painful.
7 0
3 years ago
Read 2 more answers
Explain why gravity is the only force acting on a falling ball
Usimov [2.4K]

Answer:

Gravity is the only force acting on a falling ball because of free fall. Since gravity is unbalanced it accelerates an object and the velocity increases as an object falls due to gravity pushing it. The acceleration due to gravity is 9.8 m/s^2.

4 0
3 years ago
How dose the hypothesis and observations connect
gavmur [86]

Answer:

<em>In the observational method, the hypothesis is constructed to explain the observations. A simple one may be a generalization of the observations. A more complex hypothesis may postulate a relationship between the events, and may even be used to predict other observations.</em>

7 0
2 years ago
Other questions:
  • If a comet is close to the sun how fast might it travel?
    5·1 answer
  • When a ball strikes a surface , it changes its shape temporarily, what type of energy is stored with the ball as it is compresse
    10·1 answer
  • According to the Big Bang theory, after the "Bang", the universe remained dark until about ___ later, when neutral atoms began f
    12·2 answers
  • What do you expect the enclosed current is for a bar magnet?
    6·1 answer
  • 2. A liquid that is twice as dense as water is used in a barometer. With this barometer, atmospheric pressure would push the liq
    13·1 answer
  • The drawing shows three particles far away from any other objects and located on a straight line. The masses of these particles
    11·1 answer
  • A girl flies a kite at a height of 500 ft, the wind carrying the kite horizontally away from her at a rate of 20 ft/sec. How fas
    9·1 answer
  • Question 15 (3.33 points) Solve: What work is done when 3.0 C is moved through an electric potential difference of 1.5 V?
    13·1 answer
  • The drag force due to air resistance on a soccer ball traveling through the air at 20 m/s is 2.3 N. What is the drag force on th
    12·1 answer
  • What is the purpose of the thermal energy tranfer lab
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!