All categories

3 years ago

Why are radio waves considered harmless while ultraviolet waves and x-rats considered harmful

Physics

1 answer:

Anvisha [2.4K]3 years ago

7 0

They are usually thought as harmful.

You might be interested in

A flutist assembles her flute in a room where the speed of sound is 342 m/s. When she plays the note A, it is in perfect tune wi

sertanlavr [38]

Answer:

5.15348 Beats/s

4.55 mm

Explanation:

$v_1$ = Velocity of sound = 342 m/s

$v_2$ = Velocity of sound = 346 m/s

$f_1$ = First frequency = 440 Hz

Frequency is given by

$f_2=\frac{v_2}{2L_1}\\\Rightarrow f_2=\frac{346}{2\times 0.38863}\\\Rightarrow f_2=445.15348\ Hz$

Beat frequency is given by

$|f_1-f_2|=|440-445.15348|=5.15348\ Beats/s$

Beat frequency is 5.15348 Hz

Wavelength is given by

$\lambda_1=\frac{v_1}{f}\\\Rightarrow \lambda_1=\frac{342}{440}\\\Rightarrow \lambda_1=0.77727\ m$

Relation between length of the flute and wavelength is

$\lambda_1=2L_1\\\Rightarrow L_1=\frac{\lambda_1}{2}\\\Rightarrow L_1=\frac{0.77727}{2}\\\Rightarrow L_1=0.38863\ m$

At v = 346 m/s

$\lambda_2=\frac{v_2}{f}\\\Rightarrow \lambda_2=\frac{346}{440}\\\Rightarrow \lambda_1=0.78636\ m$

$L_2=\frac{\lambda_2}{2}\\\Rightarrow L_2=\frac{0.78636}{2}\\\Rightarrow L_2=0.39318\ m$

Difference in length is

$\Delta L=L_2-L_1\\\Rightarrow \Delta L=0.39318-0.38863\\\Rightarrow \Delta L=0.00455\ m=4.55\ mm$

It extends to 4.55 mm

7 0

3 years ago

Extinction of a species is most likely to occur as a result of __________.

sergejj [24]

Extinction of a species is most likely to occur as a result of "<span>environmental changes"

In short, Your Answer would be Option D

Hope this helps!</span>

8 0

3 years ago

Read 2 more answers

The scientific law that the physical universe is gradually becoming dissipated and disordered is called _____. entropy uniformit

ch4aika [34]

It is called entropy

5 0

3 years ago

a. How high did the car climb up the hill after bouncing? Did it go higher lower or the same height as the drop position?

weeeeeb [17]

THe answer is the car went higher

8 0

3 years ago

200 mL of an ideal gas is placed in a piston and is held at a pressure of 500 torr. If the temperature is held constant and the

galina1969 [7]

Answer:

V₂=153.84 m L

Explanation:

Given that

Initial volume ,V₁ = 200 m L

Initial pressure ,P₁= 500 torr

Final pressure P₂ = 650 torr

Lets take the final volume =V₂

Given that process occurs at constant temperature and we know that for constant temperature process

P₁ V₁ = P₂ V₂

$V_2=\dfrac{P_1V_1}{P_2}$

Now by putting the values

$V_2=\dfrac{500\times 200}{650}\ mL$

V₂=153.84 m L

Therefore the new volume of the gas will be 153.8 4mL.

7 0

3 years ago