An ambulance is driving towards the hospital at a velocity 108 km/h and emitting a steady 798-hz sound from its siren. the sound reflects off the front of the hospital and is received by the same ambulance. in addition to it's own siren, the ambulance hears a shifted tone from the reflection at what frequency? the speed of sound on this day is 343 m/s. a. 1.06e+3hz b. 855hz c. 850hz d. 1.08e+3hz e. 950 hz

To solve this problem we will apply the concepts related to the Doppler effect. The Doppler effect is a physical phenomenon where an apparent change in wave frequency is presented by a sound source with respect to its observer when that same source is in motion. Mathematically it can be described as

The meaning of each of these variables is,

Velocity of detector

=Frequency of wave emitted by source

Velocity of source

v=Velocity of sound wave

=Frequency received by detector

Replacing we have that,

Therefore the correct option is e. 950Hz

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;