3.5 meters per second second is the acceleration because we know that acceleration is change in velocity over time and the change is velocity here is 35 and the time is 10 so we can simply divide 35 by 10 which is 3.5 m/s squared
Answer:
f = 295.06 Hz
Explanation:
Este es un típico ejercicio de efecto doppler donde tenemos una fuente emisora de una frecuencia.
En este caso, vemos una ambulancia que se está desplazando a cierta velocidad emitiendo una frecuencia particular. Un observador que está en la calle decide alejarse, corriendo a una velocidad, que obviamente es menor que la de la ambulancia, pero el caso es que se está alejando de la fuente emisora del sonido, en este caso de la ambulancia.
Como se están alejando, podemos usar la siguiente expresión:
f = (v - v₀ / v) * f₀
Donde:
f: frecuencia percibida por la persona.
v: velocidad de la ambulancia
v₀: velocidad de la persona
f₀: frecuencia emitida por la ambulancia.
Teniendo todos esos valores, solo debemos reemplazar en la expresión:
f = (34 - 1 / 34) * 304
f = (33/34) * 304
<h2>
f = 295.06 Hz</h2>
Espero te ayude
Answer:
B.) by interfering with sound waves
Explanation:
As we know that the interference of sound waves is of two types
1). constructive interference
2). destructive interference
now we know that constructive interference means the resultant intensity will be more than the intensity of interfering waves as here two waves are in same phase.
In destructive interference the resultant of two waves is given by the minimum resultant of the intensity as here the phase of two waves are opposite to each other.
So we will say that
here in case of noise cancelling headphones we know that the phase of noise is always made in opposite phase with the sound which is used to cancelled the noise.
This will reduce the noise and we will get a clear sound
Brass, Salt and water are examples of a Homogeneous Mixture.
Answer:
3.73 * 10^16 photons/sec
Explanation:
power supply = 3.0 V
Emits 440 nm blue light
current in LED = 11 mA
efficiency of LED = 51%
<u>Calculate the number of photons per second the LED will emit </u>
first step : calculate the energy of the Photon
E = hc / λ
=( 6.62 * 10^-34 * 3 * 10^8 ) / 440 * 10^-9
= 0.0451 * 10^-17 J
Next :
Number of Photon =( power supply * efficiency * current ) / energy of photon
= ( 3 * 0.51 * 11 * 10^-3 ) / 0.0451 * 10^-17
= 3.73 * 10^16 photons/sec
