Which one of the following is true?
1 answer:
Answer:
(C) All spontaneous nuclear reactions are exothermic.
Explanation:
the answer is option C
Here the Spontaneous nuclear reactions occur on its own. You don't have to have any outside force. Mass defects are converted into energy during the reaction.
Mass defects are the difference between the overall product mass and the overall reactant mass.
The expression ' ' shows both the mass defect and the energy emitted, where, C is the speed of light.
Because energy is always released in spontaneous nuclear reactions, all nuclear spontaneous reactions are always exothermic.
Hence the correct option is C
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Complete question:
while hunting in a cave a bat emits sounds wave of frequency 39 kilo hartz were moving towards a wall with a constant velocity of 8.32 meters per second take the speed of sound as 340 meters per second. calculate the frequency reflected off the wall to the bat?
Answer:
The frequency reflected by the stationary wall to the bat is 41 kHz
Explanation:
Given;
frequency emitted by the bat, = 39 kHz
velocity of the bat, = 8.32 m/s
speed of sound in air, v = 340 m/s
The apparent frequency of sound striking the wall is calculated as;
The frequency reflected by the stationary wall to the bat is calculated as;