Vdy chgn dap an D.. Vdy chon dap an C.. Vdy chgn dap an B.
Trang 1Giai
M 6 i quang pho vach deu dac t r i m g cho mot nguyen to ve so vach,
vi t r i sAp xep, cifdng do sang,
Vdy chgn dap an D
Cdu 32.- M o t dong v i phong xa c6 chu k i ban r a T Cuf sau m o t khoang
thcfi gian bang bao nhieu t h i so h a t n h a n b i p h a n r a t r o n g khoang
thdi gian do bang ba Ian so h a t n h a n con l a i cua dong v i ay?
A T B 3T C 2T D 0,5T
Giai
Goi No la so h a t n h a n ban dau
N
So h a t n h a n con l a i la: N = — p
2 ^
N '
-So h a t n h a n b i p h a n r a la: N ' = No - N = No f- =
Theo gia t h i e t : N ' = 3 N = > NQ
1 - 2 ^
1 - 2 '
V
= 3 N o 2 T = ^ 1 - 2 T = 3 2 '
-t t
,2
^ 1 = 4 2 ^ ^ 2 T = 4 = 2 ' 1 = 2 1
Vdy chon dap an C
Cdu 33: M o t vat dao dong dieu hoa theo mo t true co d i n h (moc the
nang of v i t r i can bkng) t h i :
A k h i vat d i tCr v i t r i can bSng ra bien, v a n toe va gia toe cua vat
luon cung dau
B the n a n g cua vat C L T C dai k h i vat of v i t r i bien
C dong nang cua v a t ctfc dai k h i gia toe cua v a t c6 dp Idfn cifc dai
D k h i d v i t r i can bang, the nSng cua v a t bang cq nSng
Giai
M o t vat dao dong dieu hoa theo mot true co d i n h (moc the nang of
v i t r i can bang) t h i the n a n g cua vat cifc dai k h i v a t d v i t r i bien
Vdy chgn dap an B
Cdu 34: M o t dam nguyen tuf hidro dang or t r a n g t h ^ i k i c h t h i c h ma
electron chuyen dong t r e n quy dao dCfng N K h i electron chuy§n ve eac
quy dao dCfng ben t r o n g t h i quang pho vach phat xa cua dam nguyen
tuf d6 C O bao nhieu vach?
A 3 B 1 C 4 D 6
, GiSi Chi tiet as thi T S D H , C B M6n V4t l( 41