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3 years ago

10

The atomic number of yttrium is 39. The atomic mass of one of its isotopes is 89. How many neutrons are in an atom of this isoto

pe?

1 answer:

gogolik [260]3 years ago

8 0

50. The atomic mass is essentially a tally of all of the atoms in the nucleus, since electrons are essentially negligible in mass.

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A yoyo is hanging motionless from a string. Identify and describe the forces exerted on the string.

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Potential and kinetic energy along with an external force

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4 years ago

What does erosion do to land forms and to sediment

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3 years ago

A repelling force occurs between two charged objects when

fgiga [73]

<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ It would be 'when they have like charges.'

'Like charges' means the same charge. For example, two positive charged objects have like charges.

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➶ Hope This Helps You!

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3 years ago

Gold has a specific heat of 0.130 J/g*C. If 195 joules of heat are added to 15 grams of gold how much does the temperature of th

Anna71 [15]

The correct answer to the question is : $100\ ^0C$

EXPLANATION :

As per the question, the specific heat of gold is given as c = $0.130\ J/g^0C$

The heat given to the gold dQ = 195 J

The mass of the gold is given as m = 15 gram.

We are asked to calculate the change in temperature.

Let the change in temperature is dT.

We know that dQ = mcdT

$dT=\ \frac{dQ}{mc}$

$=\ \frac{195}{15\times 0.130}$

$=\ 100\ ^0C$ [ANS]

Hence, the change in temperature is 100 degree celsius.

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4 years ago

Blue light has a typical frequency of 6.67 x 10 14 1014 Hz. What is the wavelength associated with this frequency?

DerKrebs [107]

First recall the equation that relates frequency to wavelength:

v = fw

Note that the v is the speed of light, a constant. Now plug in the information we know!

(3×10^8) = (6.67 × 10^14) w

Hit the numbers on the calculator and you'll get the wavelength, w. If you comment your answer I'll check it for you. :)

5 0

4 years ago

Read 2 more answers