Biology; Chemistry; Physics: Post your doubts here!

[luckywang]

help me pls...
describe the use of magnetic materials in audio/video tapes.
discuss the dating of objects by the use of 14C.
describe how the Geiger-Marsden alpha-particle scattering experiment provides evidence for the nuclear atom.

 

[syed1995]

D...the ray is perpendicular why still bend?

there goes another mark ..

 

[Fallen316]

this is the only method you will ever need to learn . And i solved all questions of pp's through this

CLICK LIKE IF IT HELPED !

 

[syed1995]

this is the only method you will ever need to learn . And i solved all questions of pp's through this

CLICK LIKE IF IT HELPED !

that's exactly the method which i use to solve them already ..

just use the power of (1/2)^n instead of dividing it each time to find the no. of half lives ...

If mass goes from 64 grams to 2 grams .. the short method to find no. of half lifes would be.

For Number of half lifes.

64/2=2^n
32=2^n
n=5

now that comes in handy for me .. since i remember all the powers of 2 till 2^10.

 

[syed1995]

Explanation Please!

 

[Mayedah]

Explanation Please!

D is it the answer !

 

[daredevil]

Here are a few questions that i came across:

Q1- Why is the stem of a thermometer often oval in cross section?

Q2-Which of the following statements about alpha particles is not true?
A. they can be deflected by magnetic field
B. they can be deflected by electric fiel
C. they can be detected by spark counter
D. they are radioactive
(first tell me ur answer then i'll tell the correct answer )

Q3-State 2 precautions u should take wen using vernier calipers. (except zero error)

Q4-State 2 precautions u shud take wen using a micrometer screw guage (except zero error)

Please answer asap!!

 

[haha101]

Explanation Please!

temp increase ! molucules of wire vibrate faster n collide more with the electron current producing more hinderence !
therea s formula resistance = (roh) x length/ cross sectional area !

 

[Fallen316]

Explanation Please!

A
thicker the wire lower the resistance.
lower the temperature lower the resistance. ( thermistors are an exception, dont confuse it with others )

 

[haha101]

Here are a few questions that i came across:

Q1- Why is the stem of a thermometer often oval in cross section?

Q2-Which of the following statements about alpha particles is not true?
A. they can be deflected by magnetic field
B. they can be deflected by electric fiel
C. they can be detected by spark counter
D. they are radioactive
(first tell me ur answer then i'll tell the correct answer )

Q3-State 2 precautions u should take wen using vernier calipers. (except zero error)

Q4-State 2 precautions u shud take wen using a micrometer screw guage (except zero error)

Please answer asap!!

Q it acts as a magnifyer to see big reading

2 as it is itself a radiation

4 : use ratchet

Dunno the rest

 

[Mayedah]

Here are a few questions that i came across:

Q1- Why is the stem of a thermometer often oval in cross section?

Q2-Which of the following statements about alpha particles is not true?
A. they can be deflected by magnetic field
B. they can be deflected by electric fiel
C. they can be detected by spark counter
D. they are radioactive
(first tell me ur answer then i'll tell the correct answer )

Q3-State 2 precautions u should take wen using vernier calipers. (except zero error)

Q4-State 2 precautions u shud take wen using a micrometer screw guage (except zero error)

Please answer asap!!

Qno 2 answer is it C my guess !

 

[daredevil]

Here are a few questions that i came across:

Q1- Why is the stem of a thermometer often oval in cross section?

Q2-Which of the following statements about alpha particles is not true?
A. they can be deflected by magnetic field
B. they can be deflected by electric fiel
C. they can be detected by spark counter
D. they are radioactive
(first tell me ur answer then i'll tell the correct answer )

Q3-State 2 precautions u should take wen using vernier calipers. (except zero error)

Q4-State 2 precautions u shud take wen using a micrometer screw guage (except zero error)

Please answer asap!!

 

[Fallen316]

daredevil , please tell me i'm correct

 

[Mayedah]

A
thicker the wire lower the resistance.
lower the temperature lower the resistance. ( thermistors are an exception, dont confuse it with others )

Yeah its A my bad M

 

[syed1995]

Q2-Which of the following statements about alpha particles is not true?
A. they can be deflected by magnetic field
B. they can be deflected by electric fiel
C. they can be detected by spark counter
D. they are radioactive
(first tell me ur answer then i'll tell the correct answer )

D ? lol they are a form of radiation .. and they do not give out radiation themselves .. not sure

 

[Fallen316]

Here are a few questions that i came across:

Q1- Why is the stem of a thermometer often oval in cross section?

Q2-Which of the following statements about alpha particles is not true?
A. they can be deflected by magnetic field
B. they can be deflected by electric fiel
C. they can be detected by spark counter
D. they are radioactive
(first tell me ur answer then i'll tell the correct answer )

Q3-State 2 precautions u should take wen using vernier calipers. (except zero error)

Q4-State 2 precautions u shud take wen using a micrometer screw guage (except zero error)

Please answer asap!!

1) it acts as a magnifying glass to read the temperature
2)D
3) and 4)
1.parallax error
2. dun know

 

[daredevil]

Here are a few questions that i came across:

Q1- Why is the stem of a thermometer often oval in cross section?

Q2-Which of the following statements about alpha particles is not true?
A. they can be deflected by magnetic field
B. they can be deflected by electric fiel
C. they can be detected by spark counter
D. they are radioactive
(first tell me ur answer then i'll tell the correct answer )

Q3-State 2 precautions u should take wen using vernier calipers. (except zero error)

Q4-State 2 precautions u shud take wen using a micrometer screw guage (except zero error)

Please answer asap!!

 

[syed1995]

Answer will be B?

 

[Fallen316]

Answer will be B?

yup. B

 

[ayeshaK]

yup. B

Yes B