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katovenus [111]
2 years ago
8

An echo is not heard in a small room.why ? give reason​

Physics
2 answers:
JulsSmile [24]2 years ago
7 0

Answer:

They can't hear an echo in small room because in it the sound can't be reflected back. For an echo of a sound to be heard,the minimum distance between the source of sound and the walls of the room should be 17.2 m.

hopw it helps

Stella [2.4K]2 years ago
7 0
The room is too small it has to be ag least 17.2 meters for the noise to bounce
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klio [65]

Answer:

1.08

Explanation:

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path difference created will be 2μ t.

For light coming from rarer to denser medium , a phase change of π occurs additionally after reflection from denser medium, here, two times, once from upper layer and then from the lower layer ,  so for constructive interference

path diff = nλ , for minimum t , n =1

path diff = λ

2μ t. =  λ

μ = λ / 2t

= 626 / 2 x 290

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5 0
3 years ago
A 15.0-kg child descends a slide 2.40 m high and reaches the bottom with a speed of 1.10 m/s .
pickupchik [31]

The thermal energy that is generated due to friction is 344J.

<h3>What is the thermal energy?</h3>

Now we know that the total mechanical energy in the system is constant. The loss in energy is given by the loss in energy.

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KE = 0.5 * mv^2 =0.5 * 15.0-kg * (1.10 m/s)^2 = 9.1 J

PE = mgh = 15.0-kg * 9.8 m/s^2 *  2.40 m = 352.8 J

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7 0
2 years ago
Which of the following is incorrect for nuclear forces
densk [106]

Answer:

c they obey inverse square law

4 0
2 years ago
Read 2 more answers
What is the acceleration of a ball traveling horizontally with an initial velocity of 20 meters/second and, 2.0 seconds later, a
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The acceleration of the ball is 5 m/s^2. This can be calculated using a formula that relates the change in velocity, acceleration, and time. This formula is:

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Substituting the values gives:

30 = 20 + a(2)
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2 years ago
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igor_vitrenko [27]

Answer:

A. True.

Explanation:

It['s true because the basic and general definition of media is "methods for communicating information".

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3 years ago
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