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
Greeley [361]
3 years ago
11

Why do people tend to cup their hands around listeners' ears when whispering to them? A) A cupped hand makes the sound echo so t

he listener can hear more clearly. B) The ear cannot absorb sound waves produced by a whisper without a cupped hand. C) Solid objects, such as a cupped hand, can direct sound waves into the ear of the listener. D) Sound waves from a whisper are short; they will not reach the listener's ear unless guided by a hand. Eliminate
Physics
2 answers:
WITCHER [35]3 years ago
6 0
C. Hope this helps you!
pashok25 [27]3 years ago
4 0

Answer: Option (C) is the correct answer.

Explanation:

In solids, sound travels faster because in solids the molecules are much more closer to each other as compared to liquids and gases.

Hence, distance between molecules is the minimum in solids and sound passes from one molecule to another easily.

Thus, we can conclude that people tend to cup their hands around listeners' ears when whispering to them because solid objects, such as a cupped hand, can direct sound waves into the ear of the listener.  

You might be interested in
What is the mass of a baseball clocked moving at a speed of 105 mph or 46.9 m/s and wavelength 9.74 × 10-35m?
Andrew [12]
For this problem to be solved, we make use of the de Broglie formula which is written below as follows:

λ = h/mv
where h is 6.626×10⁻³⁴ J·s

9.74 × 10⁻³⁵ m = 6.626×10⁻³⁴ J·s/ (m)(46.9 m/s)
Solving for m,
<em>m = 0.145kg</em>
6 0
3 years ago
Tina wants to install one unit that both heats and cools. Which should Tina install?
madreJ [45]
A heat pump? it might be furnace but i think its heat pump
8 0
3 years ago
Read 2 more answers
About how many electrons are in 30 grams of water (H2O)?
jarptica [38.1K]

Hydrogen (H) has a molar mass of about 1.007 g/mol and has 1 electron.

Oxygen (O) has a molar mass of about 15.999 g/mol and has 8 electrons.

Then water (H₂O) has a total molar mass of about 18.015 g/mol and has 10 electrons.

30 g of water is the mass of

(30 g) × (1/18.015 mol/g) ≈ 1.66528 mol

of water. Recall that 1 mole is around 6.022 × 10²³ molecules (i.e. Avogadro's number). So 30 g of water is the mass of approximately 1.00285 × 10²⁴ molecules of water.

If each molecule contains 10 electrons, then 30 g of water contains 1.00285 × 10²⁵ ≈ 10²⁵ electrons.

5 0
3 years ago
How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C?
Ilya [14]
I believe it requires 1,314,718 J. Have a great day =D
5 0
3 years ago
You run 100 m in 25 s. If you later
Anastaziya [24]
You want to do distance divided by time. 100/25 = a then you can find it if it increase or decrease
5 0
3 years ago
Other questions:
  • The density of aluminum is 2.7 × 103 kg/m3 . the speed of longitudinal waves in an aluminum rod is measured to be 5.1 × 103 m/s.
    15·1 answer
  • hi can someone help plz im too confused....Describe how mass and distance affect gravitational force.
    7·2 answers
  • Now consider a finite-span wing with the same profile, chord and attack angle flying at 5 km altitude with a speed of 50 m/s. Th
    7·1 answer
  • Mr. Smith used 606 kWh for the month. If the service charge was $61.37 (see back page of the bill), what is the approximate char
    11·1 answer
  • Two wires carry current I1 = 73 A and I2 = 31 A in the opposite directions parallel to the x-axis at y1 = 3 cm and y2 = 13 cm. W
    6·1 answer
  • What do the peaks represent
    11·1 answer
  • Which conclusion is best supported by the information in the chart?
    8·2 answers
  • Which nuclear reaction is used to generate electric energy in power plants?
    5·2 answers
  • A student holds a bike wheel and starts it spinning with an initial angular speed of 9.0 rotations per second. The wheel is subj
    13·1 answer
  • The apparent brightness of stars in general tells us nothing about their distances; we cannot assume that the dimmer stars are f
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!