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3 years ago

Which statement best describes wavelength?

Physics

2 answers:

Lesechka [4]3 years ago

8 0

Answer: Wavelength is the length of one complete wave cycle (Option C)

Explanation:

Wavelength is the distance between two consecutive crests or troughs. It can be measured by any two consecutive points in a wave. Wavelength is commonly designated by the sign λ (lambda). Wavelength depends on the medium ( for example air, water or vacuum) that a wave travels through.

According to the following wave equation, it can also be deduced that wavelength is inversely proportional to frequency.

V = f λ

V is the speed

F is the frequency

λ is wavelength

Nataly_w [17]3 years ago

5 0

C. Wavelength is the length of one complete wave cycle

Wavelength of a sine wave, λ, can be measured between any two points with the same phase, such as between crests, or troughs, or corresponding zero crossings as shown

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The strength of the Earth’s magnetic field B at the equator is approximately equal to 5 × 10−5 T. The force on a charge q moving

Blizzard [7]

Answer:

$2.4\cdot 10^{-11} N$

Explanation:

Since the Earth's magnetic field is perpendicular to your direction of motion, the strength of the magnetic force exerted on your head is given by:

$F=qvB$

where:

$q=6\cdot 10^{-9}C$ is the charge on your head

$v=80 m/s$ is the speed at which you are moving

$B=5\cdot 10^{-5} T$ is the strength of the magnetic field of the Earth

By substituting these numbers into the equation, we find the strength of the magnetic force:

$F=(6\cdot 10^{-9}C)(80 m/s)(5\cdot 10^{-5} T)=2.4\cdot 10^{-11} N$

7 0

3 years ago

A race car makes one lap around a track of radius 180 m in 90.0 s. What is the centripetal acceleration in m/s2?

kvasek [131]

Answer:

0.9m/s^2 (yours is 0.87, so choose that)

Explanation:

formula for centripetal acceleration:

v^2/r

to find v, we know that f=1/90s, and r=180m.

v=(2pir)/T

v=(2pi(180))/90

v=12.6m/s

now plug into a=v^2/r

a=(12.6)^2/180

a=0.9m/s^2

4 0

3 years ago

Two lamps rated 60W; 240V and 100W, 240Vrespectively are connected in series to a 240V power source. Calculate;

nikdorinn [45]

Answer:

See the answers below.

Explanation:

The total power of the circuit is equal to the sum of the powers of each lamp.

$P=60+100\\P=160 [W]$

Now we have a voltage source equal to 240 [V], so by means of the following equation we can find the current circulating in the circuit.

$P=V*I$

where:

P = power [W]

V = voltage [V]

I = current [amp]

$I = P/V\\I=160/240\\I=0.67 [amp]$

So this is the answer for c) I = 0.67 [amp]

We know that the voltage of each lamp is 240 [V]. Therefore using ohm's law which is equal to the product of resistance by current we can find the voltage of each lamp.

$V=I*R$

where:

V = voltage [V]

I = current [amp]

R = resistance [ohms]

Therefore we replace this equation in the first to have the current as a function of the resistance and not the voltage.

$P=V*I\\and\\V = I*R\\P = (I*R)*I\\P=I^{2}*R$

$60 = (0.67)^{2}*R\\R_{60}=133.66[ohm] \\and\\100=(0.67)^{2} *R\\R_{100}=100/(0.66^{2} )\\R_{100}=225 [ohm]$

The effective resistance of a series circuit is equal to the sum of the resistors connected in series.

$R = 133.66 + 225\\R = 358.67 [ohms]$

7 0

3 years ago

How much mass does the sun have? <33

zlopas [31]

Explanation:

1.989 × 10^30 kg

7 0

3 years ago

If the rifle is stopped by the hunter's shoulder in a distance of 3.23 cm, what is the magnitude of the average force exerted on

never [62]

By conservation of momentum, the initial recoil speed of the rifle is:
u = 904kg * 0.0106 kg / 3.53 kg = 2.7146 m/s

The final recoil speed v is zero in a distance of d = 0.0346 m

So the rifle's acceleration is a = (0 - u^2) / 2*d = -2.7146^2 / 2*.0323 m/s^2
a = -114.07m/s^2

6 0

3 years ago