1. a floating object moves up and down 15 times in 60. seconds because of ocean waves. calculate the period of the ocean waves. Period (T) = total time /#oscillations counted

*60/15 = 4 T

2. calculate the frequency of the ocean waves. show your calculations and include units in your answer.

3. an additional wave property must be known in order to calculate the velocity of the ocean waves. identify the additional property.

period

frequency

wavelength

speed

4. describe what will happen to the object if the amplitude of the ocean waves increases and all other wave characteristics stay the same.

plz help, i think i have #1 correct but i need help with the rest, just trying to graduate.. will give brainliest

1. 4 s 2. 0.25 Hz 3. wavelength 4. The height the object moves up and down increases

Explanation:

1. Period, T = total time/number of oscillations

total time = 60 s, number of oscillations = 15

T = 60 s/15 = 4 s

2. Frequency, f = 1/T = 1/4 = 0.25 Hz

3. The wavelength, λ. Since the velocity v = fλ

4. If he amplitude of the ocean waves increase and all other wave characteristics, the height the object moves up and down increases. This amplitude of the wave is independent of all the other properties of the wave.

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.