As a wave source movies away from you which of the following is true wavelength

Question

As a wave source movies away from you which of the following is true wavelength increases, speed increase, frequency increases wavelength decreases, speed increase, frequency increases wavelength increase, speed remains same, frequency decreases wavelength decreases, speed is same, frequency increases wavelength increase, speed is same, frequency increases An apple weighs 16 N on the surface of the earth, a distance d from the center. How much would the apple weigh if it was on a planet that was three times as massive as the earth, but had 1/2 the radius of the earth? 1/2 as much 12 times as much 4 times as much 3/2 times as much 48 times as much A vault is opened by applying a force of 200 N at 30 degrees to the plane of the door. 1.0m from the hinges. Find the torque due to this force about an axis through the hinges. 200 N-m 100 N-m 50 N-m 150 N-m 75 N-m If the moment inertia of the door above is 20 kg. m^2, what is the angular acceleration of the door? 0.1 rad/s^2 2 rad/s^2 5 rad/s^2 10 rad/s^2 3.14 rad/s^2 A 0.2 ka ball rotates at a constant speed of 3 m/s on the end of 1.2 m long string The string describes a horizontal circle. What is the centripetal force _____ and centripetal acceleration of the object ________? 7.5 N; 1.2 m/s^2 3.9 N: 3 m/s^2 1.5 N; 7.5 m/s^2 6 N: 3.2 m/s^2 2.5 N; 2.4 m/s^2 A mass is attached to a spring of spring constant k and stretched a distance A and held there and released. At what value of x is the potential energy 1/4 of the total energy? A 1/2A 1/4A 0.7A 3/2A 174

Explanation / Answer

here,

5)

The Doppler effect (for sound) is a change in the observed frequency of sound waves caused by relative motion between a sound source and an observer .

If the source and observer are moving towards each other, the frequency is increased;

if they are moving away from each other the frequency is decreased.

This is due the change in the number of waves passing-by the observer each second.

so, when the wave source moves away,

the frequency decraeses

and the speed of sound is same

v = f * lamda

the wavelength increases

so, the correct option is c) wavelength increases , speed is same , frequency decreases

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