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anyanavicka [17]
3 years ago
12

Which statement is true for a sound wave entering an area of warmer air?

Physics
2 answers:
Vedmedyk [2.9K]3 years ago
6 0
Answer is A, Sound waves will travel faster on warm air because collisions of molecules of air in warm air are greater.
Marrrta [24]3 years ago
4 0

Explanation:

Sound wave depends on the temperature of of the surrounding. When the temperature is high, the molecules will have higher energy and they vibrates faster. When the molecules vibrates faster, sound will travel more quickly.

Other factors on which sound wave depend are density of medium, humidity, air pressure etc.

Hence, the correct option is (a) :"The wave travels faster and with the same wavelength".

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For the image of the overhead projector to be in focus, the distance from the projector lens to the image, <img src="https://tex
rjkz [21]
Given:
distance from the projector lens to the image, di
projector lens focal length, f
distance from the transparency to the projector lens, do

thin lens equation: 1/f = 1/di + 1/do
do = 4 inches
di = 8 feet

convert feet to inches, for uniformity.
1 foot = 12 inches
8 feet * 12 inches/ft = 96 inches
 
1/f = 1/96 inches + 1/4 inches

Adding fractions, denominator must be the same.

1/f = (1/96 * 1/1) + (1/4 * 24/24)
1/f = 1/96 + 24/96
1/f = 25/96

to find the value of f, do cross multiplication
1*96 = f * 25
96 = 25f
96/25 = f
3.84 = f

The focal length of the project lens is 3.84 inches 

4 0
3 years ago
A 72-tooth gear is connected to a 12-tooth gear. If the large gear makes one complete turn, how many turns
viktelen [127]
You divide 72 by 12 to get 6.
8 0
3 years ago
A wave with a wavelength of 0.1 m moves with a speed of 0.5 m/s. What is the frequency of the wave?
kondaur [170]
Frequency= speed/ wavelength
=0.5m/s divided 0.1.m
=5.0 Hz

The answer would be letter D.
3 0
4 years ago
1) The unit of power is
miss Akunina [59]

Answer:

1) the unit of power is A.Watt

2)100J=50W

100=50s

divide both sides by 50s

S=2s(A)

4 0
3 years ago
Need help ASAP
kati45 [8]

Answer:

Explanation:

1.electric

2.radio wave

3.broadcast

Hope it helped you.

8 0
3 years ago
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